author | paulson |
Tue, 05 Sep 2000 10:15:23 +0200 | |
changeset 9840 | 9dfcb0224f8c |
child 9869 | 95dca9f991f2 |
permissions | -rw-r--r-- |
9840
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
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1 |
(* Title: HOL/ex/meson |
9dfcb0224f8c
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2 |
ID: $Id$ |
9dfcb0224f8c
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3 |
Author: Lawrence C Paulson, Cambridge University Computer Laboratory |
9dfcb0224f8c
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4 |
Copyright 1992 University of Cambridge |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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5 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
6 |
The MESON resolution proof procedure for HOL |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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7 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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8 |
When making clauses, avoids using the rewriter -- instead uses RS recursively |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
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9 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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10 |
NEED TO SORT LITERALS BY # OF VARS, USING ==>I/E. ELIMINATES NEED FOR |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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11 |
FUNCTION nodups -- if done to goal clauses too! |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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12 |
*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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13 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
14 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
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15 |
(**** LEMMAS : outside the "local" block ****) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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16 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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17 |
(** "Axiom" of Choice, proved using the description operator **) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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18 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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19 |
Goal "ALL x. EX y. Q x y ==> EX f. ALL x. Q x (f x)"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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20 |
by (fast_tac (claset() addEs [selectI]) 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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21 |
qed "choice"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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22 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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23 |
(*** Generation of contrapositives ***) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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24 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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25 |
(*Inserts negated disjunct after removing the negation; P is a literal*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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26 |
val [major,minor] = Goal "~P|Q ==> ((~P==>P) ==> Q)"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
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27 |
by (rtac (major RS disjE) 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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28 |
by (rtac notE 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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29 |
by (etac minor 2); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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30 |
by (ALLGOALS assume_tac); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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31 |
qed "make_neg_rule"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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32 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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33 |
(*For Plaisted's "Postive refinement" of the MESON procedure*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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34 |
Goal "~P|Q ==> (P ==> Q)"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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35 |
by (Blast_tac 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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36 |
qed "make_refined_neg_rule"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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37 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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38 |
(*P should be a literal*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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39 |
val [major,minor] = Goal "P|Q ==> ((P==>~P) ==> Q)"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
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40 |
by (rtac (major RS disjE) 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
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41 |
by (rtac notE 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
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42 |
by (etac minor 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
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43 |
by (ALLGOALS assume_tac); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
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changeset
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44 |
qed "make_pos_rule"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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45 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
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46 |
(*** Generation of a goal clause -- put away the final literal ***) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
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47 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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changeset
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48 |
val [major,minor] = Goal "~P ==> ((~P==>P) ==> False)"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
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49 |
by (rtac notE 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
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changeset
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50 |
by (rtac minor 2); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
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changeset
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51 |
by (ALLGOALS (rtac major)); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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changeset
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52 |
qed "make_neg_goal"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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53 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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changeset
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54 |
val [major,minor] = Goal "P ==> ((P==>~P) ==> False)"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
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55 |
by (rtac notE 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
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56 |
by (rtac minor 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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changeset
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57 |
by (ALLGOALS (rtac major)); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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58 |
qed "make_pos_goal"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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59 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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60 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
diff
changeset
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61 |
(**** Lemmas for forward proof (like congruence rules) ****) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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62 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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63 |
(*NOTE: could handle conjunctions (faster?) by |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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64 |
nf(th RS conjunct2) RS (nf(th RS conjunct1) RS conjI) *) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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65 |
val major::prems = Goal |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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66 |
"[| P'&Q'; P' ==> P; Q' ==> Q |] ==> P&Q"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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changeset
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67 |
by (rtac (major RS conjE) 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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changeset
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68 |
by (rtac conjI 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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changeset
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69 |
by (ALLGOALS (eresolve_tac prems)); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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changeset
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70 |
qed "conj_forward"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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71 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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72 |
val major::prems = Goal |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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73 |
"[| P'|Q'; P' ==> P; Q' ==> Q |] ==> P|Q"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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changeset
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74 |
by (rtac (major RS disjE) 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
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changeset
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75 |
by (ALLGOALS (dresolve_tac prems)); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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76 |
by (ALLGOALS (eresolve_tac [disjI1,disjI2])); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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changeset
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77 |
qed "disj_forward"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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78 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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changeset
|
79 |
(*Version for removal of duplicate literals*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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changeset
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80 |
val major::prems = Goal |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
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changeset
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81 |
"[| P'|Q'; P' ==> P; [| Q'; P==>False |] ==> Q |] ==> P|Q"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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changeset
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82 |
by (cut_facts_tac [major] 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
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83 |
by (blast_tac (claset() addIs prems) 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
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84 |
qed "disj_forward2"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
diff
changeset
|
85 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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changeset
|
86 |
val major::prems = Goal |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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changeset
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87 |
"[| ALL x. P'(x); !!x. P'(x) ==> P(x) |] ==> ALL x. P(x)"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
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88 |
by (rtac allI 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
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89 |
by (resolve_tac prems 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
90 |
by (rtac (major RS spec) 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
diff
changeset
|
91 |
qed "all_forward"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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changeset
|
92 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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changeset
|
93 |
val major::prems = Goal |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
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94 |
"[| EX x. P'(x); !!x. P'(x) ==> P(x) |] ==> EX x. P(x)"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
95 |
by (rtac (major RS exE) 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
96 |
by (rtac exI 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
97 |
by (eresolve_tac prems 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
98 |
qed "ex_forward"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
99 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
100 |
(**** END OF LEMMAS ****) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
diff
changeset
|
101 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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changeset
|
102 |
local |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
diff
changeset
|
103 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
104 |
(*Prove theorems using fast_tac*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
105 |
fun prove_fun s = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
106 |
prove_goal (the_context ()) s |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
107 |
(fn prems => [ cut_facts_tac prems 1, Fast_tac 1 ]); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
108 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
109 |
(**** Negation Normal Form ****) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
110 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
111 |
(*** de Morgan laws ***) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
112 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
113 |
val not_conjD = prove_fun "~(P&Q) ==> ~P | ~Q"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
114 |
val not_disjD = prove_fun "~(P|Q) ==> ~P & ~Q"; |
9dfcb0224f8c
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|
115 |
val not_notD = prove_fun "~~P ==> P"; |
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|
116 |
val not_allD = prove_fun "~(ALL x. P(x)) ==> EX x. ~P(x)"; |
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|
117 |
val not_exD = prove_fun "~(EX x. P(x)) ==> ALL x. ~P(x)"; |
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|
118 |
|
9dfcb0224f8c
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|
119 |
|
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|
120 |
(*** Removal of --> and <-> (positive and negative occurrences) ***) |
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|
121 |
|
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|
122 |
val imp_to_disjD = prove_fun "P-->Q ==> ~P | Q"; |
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|
123 |
val not_impD = prove_fun "~(P-->Q) ==> P & ~Q"; |
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changeset
|
124 |
|
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|
125 |
val iff_to_disjD = prove_fun "P=Q ==> (~P | Q) & (~Q | P)"; |
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changeset
|
126 |
|
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|
127 |
(*Much more efficient than (P & ~Q) | (Q & ~P) for computing CNF*) |
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|
128 |
val not_iffD = prove_fun "~(P=Q) ==> (P | Q) & (~P | ~Q)"; |
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changeset
|
129 |
|
9dfcb0224f8c
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changeset
|
130 |
|
9dfcb0224f8c
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changeset
|
131 |
(**** Pulling out the existential quantifiers ****) |
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changeset
|
132 |
|
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|
133 |
(*** Conjunction ***) |
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changeset
|
134 |
|
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|
135 |
val conj_exD1 = prove_fun "(EX x. P(x)) & Q ==> EX x. P(x) & Q"; |
9dfcb0224f8c
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changeset
|
136 |
val conj_exD2 = prove_fun "P & (EX x. Q(x)) ==> EX x. P & Q(x)"; |
9dfcb0224f8c
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parents:
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changeset
|
137 |
|
9dfcb0224f8c
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changeset
|
138 |
(*** Disjunction ***) |
9dfcb0224f8c
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parents:
diff
changeset
|
139 |
|
9dfcb0224f8c
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changeset
|
140 |
(*DO NOT USE with forall-Skolemization: makes fewer schematic variables!! |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
diff
changeset
|
141 |
With ex-Skolemization, makes fewer Skolem constants*) |
9dfcb0224f8c
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parents:
diff
changeset
|
142 |
val disj_exD = prove_fun "(EX x. P(x)) | (EX x. Q(x)) ==> EX x. P(x) | Q(x)"; |
9dfcb0224f8c
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parents:
diff
changeset
|
143 |
|
9dfcb0224f8c
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changeset
|
144 |
val disj_exD1 = prove_fun "(EX x. P(x)) | Q ==> EX x. P(x) | Q"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
diff
changeset
|
145 |
val disj_exD2 = prove_fun "P | (EX x. Q(x)) ==> EX x. P | Q(x)"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
diff
changeset
|
146 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
diff
changeset
|
147 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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diff
changeset
|
148 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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changeset
|
149 |
(***** Generating clauses for the Meson Proof Procedure *****) |
9dfcb0224f8c
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changeset
|
150 |
|
9dfcb0224f8c
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changeset
|
151 |
(*** Disjunctions ***) |
9dfcb0224f8c
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changeset
|
152 |
|
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|
153 |
val disj_assoc = prove_fun "(P|Q)|R ==> P|(Q|R)"; |
9dfcb0224f8c
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parents:
diff
changeset
|
154 |
|
9dfcb0224f8c
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parents:
diff
changeset
|
155 |
val disj_comm = prove_fun "P|Q ==> Q|P"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
156 |
|
9dfcb0224f8c
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changeset
|
157 |
val disj_FalseD1 = prove_fun "False|P ==> P"; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
158 |
val disj_FalseD2 = prove_fun "P|False ==> P"; |
9dfcb0224f8c
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parents:
diff
changeset
|
159 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
diff
changeset
|
160 |
|
9dfcb0224f8c
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paulson
parents:
diff
changeset
|
161 |
(**** Operators for forward proof ****) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
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changeset
|
162 |
|
9dfcb0224f8c
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paulson
parents:
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changeset
|
163 |
(*raises exception if no rules apply -- unlike RL*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
164 |
fun tryres (th, rl::rls) = (th RS rl handle THM _ => tryres(th,rls)) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
165 |
| tryres (th, []) = raise THM("tryres", 0, [th]); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
166 |
|
9dfcb0224f8c
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paulson
parents:
diff
changeset
|
167 |
val prop_of = #prop o rep_thm; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
168 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
169 |
(*Permits forward proof from rules that discharge assumptions*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
170 |
fun forward_res nf st = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
171 |
case Seq.pull (ALLGOALS (METAHYPS (fn [prem] => rtac (nf prem) 1)) st) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
172 |
of Some(th,_) => th |
9dfcb0224f8c
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paulson
parents:
diff
changeset
|
173 |
| None => raise THM("forward_res", 0, [st]); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
174 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
175 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
176 |
(*Are any of the constants in "bs" present in the term?*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
177 |
fun has_consts bs = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
178 |
let fun has (Const(a,_)) = a mem bs |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
179 |
| has (f$u) = has f orelse has u |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
180 |
| has (Abs(_,_,t)) = has t |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
181 |
| has _ = false |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
182 |
in has end; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
183 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
184 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
185 |
(**** Clause handling ****) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
186 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
187 |
fun literals (Const("Trueprop",_) $ P) = literals P |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
188 |
| literals (Const("op |",_) $ P $ Q) = literals P @ literals Q |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
189 |
| literals (Const("Not",_) $ P) = [(false,P)] |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
190 |
| literals P = [(true,P)]; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
191 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
192 |
(*number of literals in a term*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
193 |
val nliterals = length o literals; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
194 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
195 |
(*to detect, and remove, tautologous clauses*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
196 |
fun taut_lits [] = false |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
197 |
| taut_lits ((flg,t)::ts) = (not flg,t) mem ts orelse taut_lits ts; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
198 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
199 |
(*Include False as a literal: an occurrence of ~False is a tautology*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
200 |
fun is_taut th = taut_lits ((true, HOLogic.false_const) :: |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
201 |
literals (prop_of th)); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
202 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
203 |
(*Generation of unique names -- maxidx cannot be relied upon to increase! |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
204 |
Cannot rely on "variant", since variables might coincide when literals |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
205 |
are joined to make a clause... |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
206 |
19 chooses "U" as the first variable name*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
207 |
val name_ref = ref 19; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
208 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
209 |
(*Replaces universally quantified variables by FREE variables -- because |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
210 |
assumptions may not contain scheme variables. Later, call "generalize". *) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
211 |
fun freeze_spec th = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
212 |
let val sth = th RS spec |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
213 |
val newname = (name_ref := !name_ref + 1; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
214 |
radixstring(26, "A", !name_ref)) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
215 |
in read_instantiate [("x", newname)] sth end; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
216 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
217 |
fun resop nf [prem] = resolve_tac (nf prem) 1; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
218 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
219 |
(*Conjunctive normal form, detecting tautologies early. |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
220 |
Strips universal quantifiers and breaks up conjunctions. *) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
221 |
fun cnf_aux seen (th,ths) = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
222 |
if taut_lits (literals(prop_of th) @ seen) then ths |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
223 |
else if not (has_consts ["All","op &"] (prop_of th)) then th::ths |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
224 |
else (*conjunction?*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
225 |
cnf_aux seen (th RS conjunct1, |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
226 |
cnf_aux seen (th RS conjunct2, ths)) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
227 |
handle THM _ => (*universal quant?*) |
9dfcb0224f8c
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diff
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|
228 |
cnf_aux seen (freeze_spec th, ths) |
9dfcb0224f8c
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|
229 |
handle THM _ => (*disjunction?*) |
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|
230 |
let val tac = |
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|
231 |
(METAHYPS (resop (cnf_nil seen)) 1) THEN |
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|
232 |
(fn st' => st' |> |
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|
233 |
METAHYPS (resop (cnf_nil (literals (concl_of st') @ seen))) 1) |
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|
234 |
in Seq.list_of (tac (th RS disj_forward)) @ ths end |
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|
235 |
and cnf_nil seen th = cnf_aux seen (th,[]); |
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changeset
|
236 |
|
9dfcb0224f8c
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parents:
diff
changeset
|
237 |
(*Top-level call to cnf -- it's safe to reset name_ref*) |
9dfcb0224f8c
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|
238 |
fun cnf (th,ths) = |
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diff
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|
239 |
(name_ref := 19; cnf (th RS conjunct1, cnf (th RS conjunct2, ths)) |
9dfcb0224f8c
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parents:
diff
changeset
|
240 |
handle THM _ => (*not a conjunction*) cnf_aux [] (th, ths)); |
9dfcb0224f8c
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paulson
parents:
diff
changeset
|
241 |
|
9dfcb0224f8c
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parents:
diff
changeset
|
242 |
(**** Removal of duplicate literals ****) |
9dfcb0224f8c
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diff
changeset
|
243 |
|
9dfcb0224f8c
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parents:
diff
changeset
|
244 |
(*Forward proof, passing extra assumptions as theorems to the tactic*) |
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changeset
|
245 |
fun forward_res2 nf hyps st = |
9dfcb0224f8c
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parents:
diff
changeset
|
246 |
case Seq.pull |
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diff
changeset
|
247 |
(REPEAT |
9dfcb0224f8c
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|
248 |
(METAHYPS (fn major::minors => rtac (nf (minors@hyps) major) 1) 1) |
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|
249 |
st) |
9dfcb0224f8c
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parents:
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|
250 |
of Some(th,_) => th |
9dfcb0224f8c
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|
251 |
| None => raise THM("forward_res2", 0, [st]); |
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changeset
|
252 |
|
9dfcb0224f8c
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paulson
parents:
diff
changeset
|
253 |
(*Remove duplicates in P|Q by assuming ~P in Q |
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parents:
diff
changeset
|
254 |
rls (initially []) accumulates assumptions of the form P==>False*) |
9dfcb0224f8c
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parents:
diff
changeset
|
255 |
fun nodups_aux rls th = nodups_aux rls (th RS disj_assoc) |
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paulson
parents:
diff
changeset
|
256 |
handle THM _ => tryres(th,rls) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
257 |
handle THM _ => tryres(forward_res2 nodups_aux rls (th RS disj_forward2), |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
diff
changeset
|
258 |
[disj_FalseD1, disj_FalseD2, asm_rl]) |
9dfcb0224f8c
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parents:
diff
changeset
|
259 |
handle THM _ => th; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
260 |
|
9dfcb0224f8c
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parents:
diff
changeset
|
261 |
(*Remove duplicate literals, if there are any*) |
9dfcb0224f8c
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parents:
diff
changeset
|
262 |
fun nodups th = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
263 |
if null(findrep(literals(prop_of th))) then th |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
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parents:
diff
changeset
|
264 |
else nodups_aux [] th; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
265 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
266 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
267 |
(**** Generation of contrapositives ****) |
9dfcb0224f8c
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paulson
parents:
diff
changeset
|
268 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
269 |
(*Associate disjuctions to right -- make leftmost disjunct a LITERAL*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
270 |
fun assoc_right th = assoc_right (th RS disj_assoc) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
271 |
handle THM _ => th; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
272 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
273 |
(*Must check for negative literal first!*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
274 |
val clause_rules = [disj_assoc, make_neg_rule, make_pos_rule]; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
275 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
276 |
(*For Plaisted's postive refinement. [currently unused] *) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
277 |
val refined_clause_rules = [disj_assoc, make_refined_neg_rule, make_pos_rule]; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
278 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
279 |
(*Create a goal or support clause, conclusing False*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
280 |
fun make_goal th = (*Must check for negative literal first!*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
281 |
make_goal (tryres(th, clause_rules)) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
282 |
handle THM _ => tryres(th, [make_neg_goal, make_pos_goal]); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
283 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
284 |
(*Sort clauses by number of literals*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
285 |
fun fewerlits(th1,th2) = nliterals(prop_of th1) < nliterals(prop_of th2); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
286 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
287 |
(*TAUTOLOGY CHECK SHOULD NOT BE NECESSARY!*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
288 |
fun sort_clauses ths = sort (make_ord fewerlits) (filter (not o is_taut) ths); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
289 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
290 |
(*Convert all suitable free variables to schematic variables*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
291 |
fun generalize th = forall_elim_vars 0 (forall_intr_frees th); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
292 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
293 |
(*Create a meta-level Horn clause*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
294 |
fun make_horn crules th = make_horn crules (tryres(th,crules)) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
295 |
handle THM _ => th; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
296 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
297 |
(*Generate Horn clauses for all contrapositives of a clause*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
298 |
fun add_contras crules (th,hcs) = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
299 |
let fun rots (0,th) = hcs |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
300 |
| rots (k,th) = zero_var_indexes (make_horn crules th) :: |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
301 |
rots(k-1, assoc_right (th RS disj_comm)) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
302 |
in case nliterals(prop_of th) of |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
303 |
1 => th::hcs |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
304 |
| n => rots(n, assoc_right th) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
305 |
end; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
306 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
307 |
(*Use "theorem naming" to label the clauses*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
308 |
fun name_thms label = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
309 |
let fun name1 (th, (k,ths)) = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
310 |
(k-1, Thm.name_thm (label ^ string_of_int k, th) :: ths) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
311 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
312 |
in fn ths => #2 (foldr name1 (ths, (length ths, []))) end; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
313 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
314 |
(*Find an all-negative support clause*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
315 |
fun is_negative th = forall (not o #1) (literals (prop_of th)); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
316 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
317 |
val neg_clauses = filter is_negative; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
318 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
319 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
320 |
(***** MESON PROOF PROCEDURE *****) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
321 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
322 |
fun rhyps (Const("==>",_) $ (Const("Trueprop",_) $ A) $ phi, |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
323 |
As) = rhyps(phi, A::As) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
324 |
| rhyps (_, As) = As; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
325 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
326 |
(** Detecting repeated assumptions in a subgoal **) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
327 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
328 |
(*The stringtree detects repeated assumptions.*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
329 |
fun ins_term (net,t) = Net.insert_term((t,t), net, op aconv); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
330 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
331 |
(*detects repetitions in a list of terms*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
332 |
fun has_reps [] = false |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
333 |
| has_reps [_] = false |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
334 |
| has_reps [t,u] = (t aconv u) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
335 |
| has_reps ts = (foldl ins_term (Net.empty, ts); false) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
336 |
handle INSERT => true; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
337 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
338 |
(*Like TRYALL eq_assume_tac, but avoids expensive THEN calls*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
339 |
fun TRYALL_eq_assume_tac 0 st = Seq.single st |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
340 |
| TRYALL_eq_assume_tac i st = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
341 |
TRYALL_eq_assume_tac (i-1) (eq_assumption i st) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
342 |
handle THM _ => TRYALL_eq_assume_tac (i-1) st; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
343 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
344 |
(*Loop checking: FAIL if trying to prove the same thing twice |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
345 |
-- if *ANY* subgoal has repeated literals*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
346 |
fun check_tac st = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
347 |
if exists (fn prem => has_reps (rhyps(prem,[]))) (prems_of st) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
348 |
then Seq.empty else Seq.single st; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
349 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
350 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
351 |
(* net_resolve_tac actually made it slower... *) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
352 |
fun prolog_step_tac horns i = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
353 |
(assume_tac i APPEND resolve_tac horns i) THEN check_tac THEN |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
354 |
TRYALL eq_assume_tac; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
355 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
356 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
357 |
in |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
358 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
359 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
360 |
(*Sums the sizes of the subgoals, ignoring hypotheses (ancestors)*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
361 |
local fun addconcl(prem,sz) = size_of_term(Logic.strip_assums_concl prem) + sz |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
362 |
in |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
363 |
fun size_of_subgoals st = foldr addconcl (prems_of st, 0) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
364 |
end; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
365 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
366 |
(*Negation Normal Form*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
367 |
val nnf_rls = [imp_to_disjD, iff_to_disjD, not_conjD, not_disjD, |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
368 |
not_impD, not_iffD, not_allD, not_exD, not_notD]; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
369 |
fun make_nnf th = make_nnf (tryres(th, nnf_rls)) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
370 |
handle THM _ => |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
371 |
forward_res make_nnf |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
372 |
(tryres(th, [conj_forward,disj_forward,all_forward,ex_forward])) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
373 |
handle THM _ => th; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
374 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
375 |
(*Pull existential quantifiers (Skolemization)*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
376 |
fun skolemize th = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
377 |
if not (has_consts ["Ex"] (prop_of th)) then th |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
378 |
else skolemize (tryres(th, [choice, conj_exD1, conj_exD2, |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
379 |
disj_exD, disj_exD1, disj_exD2])) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
380 |
handle THM _ => |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
381 |
skolemize (forward_res skolemize |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
382 |
(tryres (th, [conj_forward, disj_forward, all_forward]))) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
383 |
handle THM _ => forward_res skolemize (th RS ex_forward); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
384 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
385 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
386 |
(*Make clauses from a list of theorems, previously Skolemized and put into nnf. |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
387 |
The resulting clauses are HOL disjunctions.*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
388 |
fun make_clauses ths = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
389 |
sort_clauses (map (generalize o nodups) (foldr cnf (ths,[]))); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
390 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
391 |
(*Convert a list of clauses to (contrapositive) Horn clauses*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
392 |
fun make_horns ths = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
393 |
name_thms "Horn#" |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
394 |
(gen_distinct eq_thm (foldr (add_contras clause_rules) (ths,[]))); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
395 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
396 |
(*Could simply use nprems_of, which would count remaining subgoals -- no |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
397 |
discrimination as to their size! With BEST_FIRST, fails for problem 41.*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
398 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
399 |
fun best_prolog_tac sizef horns = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
400 |
BEST_FIRST (has_fewer_prems 1, sizef) (prolog_step_tac horns 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
401 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
402 |
fun depth_prolog_tac horns = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
403 |
DEPTH_FIRST (has_fewer_prems 1) (prolog_step_tac horns 1); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
404 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
405 |
(*Return all negative clauses, as possible goal clauses*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
406 |
fun gocls cls = name_thms "Goal#" (map make_goal (neg_clauses cls)); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
407 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
408 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
409 |
fun skolemize_tac prems = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
410 |
cut_facts_tac (map (skolemize o make_nnf) prems) THEN' |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
411 |
REPEAT o (etac exE); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
412 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
413 |
(*Shell of all meson-tactics. Supplies cltac with clauses: HOL disjunctions*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
414 |
fun MESON cltac = SELECT_GOAL |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
415 |
(EVERY1 [rtac ccontr, |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
416 |
METAHYPS (fn negs => |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
417 |
EVERY1 [skolemize_tac negs, |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
418 |
METAHYPS (cltac o make_clauses)])]); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
419 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
420 |
(** Best-first search versions **) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
421 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
422 |
fun best_meson_tac sizef = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
423 |
MESON (fn cls => |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
424 |
THEN_BEST_FIRST (resolve_tac (gocls cls) 1) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
425 |
(has_fewer_prems 1, sizef) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
426 |
(prolog_step_tac (make_horns cls) 1)); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
427 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
428 |
(*First, breaks the goal into independent units*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
429 |
val safe_best_meson_tac = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
430 |
SELECT_GOAL (TRY Safe_tac THEN |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
431 |
TRYALL (best_meson_tac size_of_subgoals)); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
432 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
433 |
(** Depth-first search version **) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
434 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
435 |
val depth_meson_tac = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
436 |
MESON (fn cls => EVERY [resolve_tac (gocls cls) 1, |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
437 |
depth_prolog_tac (make_horns cls)]); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
438 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
439 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
440 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
441 |
(** Iterative deepening version **) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
442 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
443 |
(*This version does only one inference per call; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
444 |
having only one eq_assume_tac speeds it up!*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
445 |
fun prolog_step_tac' horns = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
446 |
let val (horn0s, hornps) = (*0 subgoals vs 1 or more*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
447 |
take_prefix Thm.no_prems horns |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
448 |
val nrtac = net_resolve_tac horns |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
449 |
in fn i => eq_assume_tac i ORELSE |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
450 |
match_tac horn0s i ORELSE (*no backtracking if unit MATCHES*) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
451 |
((assume_tac i APPEND nrtac i) THEN check_tac) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
452 |
end; |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
453 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
454 |
fun iter_deepen_prolog_tac horns = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
455 |
ITER_DEEPEN (has_fewer_prems 1) (prolog_step_tac' horns); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
456 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
457 |
val iter_deepen_meson_tac = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
458 |
MESON (fn cls => |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
459 |
(THEN_ITER_DEEPEN (resolve_tac (gocls cls) 1) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
460 |
(has_fewer_prems 1) |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
461 |
(prolog_step_tac' (make_horns cls)))); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
462 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
463 |
val meson_tac = |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
464 |
SELECT_GOAL (TRY Safe_tac THEN |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
465 |
TRYALL (iter_deepen_meson_tac)); |
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
466 |
|
9dfcb0224f8c
meson.ML moved from HOL/ex to HOL/Tools: meson_tac installed by default
paulson
parents:
diff
changeset
|
467 |
end; |