author | paulson |
Tue, 27 Jan 2004 15:39:51 +0100 | |
changeset 14365 | 3d4df8c166ae |
parent 9429 | 8ebc549e9326 |
child 14387 | e96d5c42c4b0 |
permissions | -rw-r--r-- |
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(* Title : RComplete.thy |
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ID : $Id$ |
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Author : Jacques D. Fleuriot |
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Copyright : 1998 University of Cambridge |
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Description : Completeness theorems for positive |
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reals and reals |
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*) |
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||
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header{*Completeness Theorems for Positive Reals and Reals.*} |
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theory RComplete = Lubs + RealArith: |
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lemma real_sum_of_halves: "x/2 + x/2 = (x::real)" |
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apply (simp) |
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done |
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subsection{*Completeness of Reals by Supremum Property of type @{typ preal}*} |
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(*a few lemmas*) |
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lemma real_sup_lemma1: |
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"\<forall>x \<in> P. 0 < x ==> |
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((\<exists>x \<in> P. y < x) = (\<exists>X. real_of_preal X \<in> P & y < real_of_preal X))" |
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by (blast dest!: bspec real_gt_zero_preal_Ex [THEN iffD1]) |
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lemma real_sup_lemma2: |
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"[| \<forall>x \<in> P. 0 < x; a \<in> P; \<forall>x \<in> P. x < y |] |
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==> (\<exists>X. X\<in> {w. real_of_preal w \<in> P}) & |
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(\<exists>Y. \<forall>X\<in> {w. real_of_preal w \<in> P}. X < Y)" |
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apply (rule conjI) |
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apply (blast dest: bspec real_gt_zero_preal_Ex [THEN iffD1], auto) |
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apply (drule bspec, assumption) |
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apply (frule bspec, assumption) |
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apply (drule order_less_trans, assumption) |
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apply (drule real_gt_zero_preal_Ex [THEN iffD1]) |
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apply (force) |
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done |
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(*------------------------------------------------------------- |
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Completeness of Positive Reals |
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-------------------------------------------------------------*) |
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(** |
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Supremum property for the set of positive reals |
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FIXME: long proof - should be improved |
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**) |
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(*Let P be a non-empty set of positive reals, with an upper bound y. |
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Then P has a least upper bound (written S). |
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FIXME: Can the premise be weakened to \<forall>x \<in> P. x\<le> y ??*) |
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lemma posreal_complete: "[| \<forall>x \<in> P. (0::real) < x; \<exists>x. x \<in> P; \<exists>y. \<forall>x \<in> P. x<y |] |
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==> (\<exists>S. \<forall>y. (\<exists>x \<in> P. y < x) = (y < S))" |
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apply (rule_tac x = "real_of_preal (psup ({w. real_of_preal w \<in> P}))" in exI) |
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apply clarify |
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apply (case_tac "0 < ya", auto) |
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apply (frule real_sup_lemma2, assumption+) |
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apply (drule real_gt_zero_preal_Ex [THEN iffD1]) |
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apply (drule_tac [3] real_less_all_real2) |
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apply (auto) |
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apply (rule preal_complete [THEN iffD1]) |
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apply (auto intro: order_less_imp_le) |
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apply (frule real_gt_preal_preal_Ex) |
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apply (force) |
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(* second part *) |
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apply (rule real_sup_lemma1 [THEN iffD2], assumption) |
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apply (auto dest!: real_less_all_real2 real_gt_zero_preal_Ex [THEN iffD1]) |
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apply (frule_tac [2] real_sup_lemma2) |
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apply (frule real_sup_lemma2, assumption+, clarify) |
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apply (rule preal_complete [THEN iffD2, THEN bexE]) |
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prefer 3 apply blast |
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apply (blast intro!: order_less_imp_le)+ |
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done |
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(*-------------------------------------------------------- |
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Completeness properties using isUb, isLub etc. |
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-------------------------------------------------------*) |
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lemma real_isLub_unique: "[| isLub R S x; isLub R S y |] ==> x = (y::real)" |
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apply (frule isLub_isUb) |
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apply (frule_tac x = y in isLub_isUb) |
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apply (blast intro!: real_le_anti_sym dest!: isLub_le_isUb) |
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done |
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lemma real_order_restrict: "[| (x::real) <=* S'; S <= S' |] ==> x <=* S" |
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by (unfold setle_def setge_def, blast) |
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(*---------------------------------------------------------------- |
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Completeness theorem for the positive reals(again) |
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----------------------------------------------------------------*) |
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lemma posreals_complete: |
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"[| \<forall>x \<in>S. 0 < x; |
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\<exists>x. x \<in>S; |
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\<exists>u. isUb (UNIV::real set) S u |
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|] ==> \<exists>t. isLub (UNIV::real set) S t" |
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apply (rule_tac x = "real_of_preal (psup ({w. real_of_preal w \<in> S}))" in exI) |
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apply (auto simp add: isLub_def leastP_def isUb_def) |
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apply (auto intro!: setleI setgeI dest!: real_gt_zero_preal_Ex [THEN iffD1]) |
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apply (frule_tac x = y in bspec, assumption) |
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apply (drule real_gt_zero_preal_Ex [THEN iffD1]) |
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apply (auto simp add: real_of_preal_le_iff) |
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apply (frule_tac y = "real_of_preal ya" in setleD, assumption) |
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apply (frule real_ge_preal_preal_Ex, safe) |
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apply (blast intro!: preal_psup_le dest!: setleD intro: real_of_preal_le_iff [THEN iffD1]) |
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apply (frule_tac x = x in bspec, assumption) |
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apply (frule isUbD2) |
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apply (drule real_gt_zero_preal_Ex [THEN iffD1]) |
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apply (auto dest!: isUbD real_ge_preal_preal_Ex simp add: real_of_preal_le_iff) |
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apply (blast dest!: setleD intro!: psup_le_ub intro: real_of_preal_le_iff [THEN iffD1]) |
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done |
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(*------------------------------- |
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Lemmas |
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-------------------------------*) |
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lemma real_sup_lemma3: "\<forall>y \<in> {z. \<exists>x \<in> P. z = x + (-xa) + 1} Int {x. 0 < x}. 0 < y" |
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by auto |
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|
119 |
lemma lemma_le_swap2: "(xa <= S + X + (-Z)) = (xa + (-X) + Z <= (S::real))" |
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|
120 |
by auto |
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parents:
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changeset
|
121 |
|
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parents:
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|
122 |
lemma lemma_real_complete2b: "[| (x::real) + (-X) + 1 <= S; xa <= x |] ==> xa <= S + X + (- 1)" |
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parents:
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changeset
|
123 |
by arith |
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parents:
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changeset
|
124 |
|
3d4df8c166ae
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parents:
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|
125 |
(*---------------------------------------------------------- |
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parents:
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|
126 |
reals Completeness (again!) |
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|
127 |
----------------------------------------------------------*) |
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parents:
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|
128 |
lemma reals_complete: "[| \<exists>X. X \<in>S; \<exists>Y. isUb (UNIV::real set) S Y |] |
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|
129 |
==> \<exists>t. isLub (UNIV :: real set) S t" |
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|
130 |
apply safe |
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parents:
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changeset
|
131 |
apply (subgoal_tac "\<exists>u. u\<in> {z. \<exists>x \<in>S. z = x + (-X) + 1} Int {x. 0 < x}") |
3d4df8c166ae
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parents:
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changeset
|
132 |
apply (subgoal_tac "isUb (UNIV::real set) ({z. \<exists>x \<in>S. z = x + (-X) + 1} Int {x. 0 < x}) (Y + (-X) + 1) ") |
3d4df8c166ae
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parents:
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diff
changeset
|
133 |
apply (cut_tac P = S and xa = X in real_sup_lemma3) |
3d4df8c166ae
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parents:
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diff
changeset
|
134 |
apply (frule posreals_complete [OF _ _ exI], blast, blast) |
3d4df8c166ae
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parents:
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changeset
|
135 |
apply safe |
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parents:
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changeset
|
136 |
apply (rule_tac x = "t + X + (- 1) " in exI) |
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parents:
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changeset
|
137 |
apply (rule isLubI2) |
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parents:
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changeset
|
138 |
apply (rule_tac [2] setgeI, safe) |
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parents:
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diff
changeset
|
139 |
apply (subgoal_tac [2] "isUb (UNIV:: real set) ({z. \<exists>x \<in>S. z = x + (-X) + 1} Int {x. 0 < x}) (y + (-X) + 1) ") |
3d4df8c166ae
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parents:
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diff
changeset
|
140 |
apply (drule_tac [2] y = " (y + (- X) + 1) " in isLub_le_isUb) |
3d4df8c166ae
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parents:
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changeset
|
141 |
prefer 2 apply assumption |
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parents:
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changeset
|
142 |
prefer 2 |
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parents:
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changeset
|
143 |
apply arith |
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parents:
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changeset
|
144 |
apply (rule setleI [THEN isUbI], safe) |
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parents:
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changeset
|
145 |
apply (rule_tac x = x and y = y in linorder_cases) |
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parents:
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changeset
|
146 |
apply (subst lemma_le_swap2) |
3d4df8c166ae
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parents:
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changeset
|
147 |
apply (frule isLubD2) |
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parents:
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changeset
|
148 |
prefer 2 apply assumption |
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parents:
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changeset
|
149 |
apply safe |
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parents:
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changeset
|
150 |
apply blast |
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parents:
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changeset
|
151 |
apply arith |
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parents:
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changeset
|
152 |
apply (subst lemma_le_swap2) |
3d4df8c166ae
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parents:
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changeset
|
153 |
apply (frule isLubD2) |
3d4df8c166ae
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parents:
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changeset
|
154 |
prefer 2 apply assumption |
3d4df8c166ae
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parents:
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diff
changeset
|
155 |
apply blast |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
156 |
apply (rule lemma_real_complete2b) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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changeset
|
157 |
apply (erule_tac [2] order_less_imp_le) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
158 |
apply (blast intro!: isLubD2, blast) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
159 |
apply (simp (no_asm_use) add: real_add_assoc) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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changeset
|
160 |
apply (blast dest: isUbD intro!: setleI [THEN isUbI] intro: add_right_mono) |
3d4df8c166ae
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paulson
parents:
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changeset
|
161 |
apply (blast dest: isUbD intro!: setleI [THEN isUbI] intro: add_right_mono, auto) |
3d4df8c166ae
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parents:
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changeset
|
162 |
done |
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parents:
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diff
changeset
|
163 |
|
3d4df8c166ae
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parents:
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changeset
|
164 |
|
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parents:
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changeset
|
165 |
subsection{*Corollary: the Archimedean Property of the Reals*} |
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changeset
|
166 |
|
3d4df8c166ae
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parents:
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changeset
|
167 |
lemma reals_Archimedean: "0 < x ==> \<exists>n. inverse (real(Suc n)) < x" |
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paulson
parents:
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changeset
|
168 |
apply (rule ccontr) |
3d4df8c166ae
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paulson
parents:
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diff
changeset
|
169 |
apply (subgoal_tac "\<forall>n. x * real (Suc n) <= 1") |
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parents:
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changeset
|
170 |
prefer 2 |
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parents:
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diff
changeset
|
171 |
apply (simp add: linorder_not_less inverse_eq_divide, clarify) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
172 |
apply (drule_tac x = n in spec) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
173 |
apply (drule_tac c = "real (Suc n)" in mult_right_mono) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
174 |
apply (rule real_of_nat_ge_zero) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
175 |
apply (simp add: real_of_nat_Suc_gt_zero [THEN real_not_refl2, THEN not_sym] real_mult_commute) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
176 |
apply (subgoal_tac "isUb (UNIV::real set) {z. \<exists>n. z = x* (real (Suc n))} 1") |
3d4df8c166ae
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paulson
parents:
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diff
changeset
|
177 |
apply (subgoal_tac "\<exists>X. X \<in> {z. \<exists>n. z = x* (real (Suc n))}") |
3d4df8c166ae
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paulson
parents:
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changeset
|
178 |
apply (drule reals_complete) |
3d4df8c166ae
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paulson
parents:
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diff
changeset
|
179 |
apply (auto intro: isUbI setleI) |
3d4df8c166ae
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paulson
parents:
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diff
changeset
|
180 |
apply (subgoal_tac "\<forall>m. x* (real (Suc m)) <= t") |
3d4df8c166ae
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paulson
parents:
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changeset
|
181 |
apply (simp add: real_of_nat_Suc right_distrib) |
3d4df8c166ae
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paulson
parents:
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changeset
|
182 |
prefer 2 apply (blast intro: isLubD2) |
3d4df8c166ae
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paulson
parents:
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diff
changeset
|
183 |
apply (simp add: le_diff_eq [symmetric] real_diff_def) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
184 |
apply (subgoal_tac "isUb (UNIV::real set) {z. \<exists>n. z = x* (real (Suc n))} (t + (-x))") |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
185 |
prefer 2 apply (blast intro!: isUbI setleI) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
186 |
apply (drule_tac y = "t+ (-x) " in isLub_le_isUb) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
187 |
apply (auto simp add: real_of_nat_Suc right_distrib) |
3d4df8c166ae
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paulson
parents:
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changeset
|
188 |
done |
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paulson
parents:
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diff
changeset
|
189 |
|
3d4df8c166ae
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paulson
parents:
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changeset
|
190 |
(*There must be other proofs, e.g. Suc of the largest integer in the |
3d4df8c166ae
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parents:
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changeset
|
191 |
cut representing x*) |
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paulson
parents:
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changeset
|
192 |
lemma reals_Archimedean2: "\<exists>n. (x::real) < real (n::nat)" |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
193 |
apply (rule_tac x = x and y = 0 in linorder_cases) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
9429
diff
changeset
|
194 |
apply (rule_tac x = 0 in exI) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
9429
diff
changeset
|
195 |
apply (rule_tac [2] x = 1 in exI) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
9429
diff
changeset
|
196 |
apply (auto elim: order_less_trans simp add: real_of_nat_one) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
197 |
apply (frule positive_imp_inverse_positive [THEN reals_Archimedean], safe) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
9429
diff
changeset
|
198 |
apply (rule_tac x = "Suc n" in exI) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
9429
diff
changeset
|
199 |
apply (frule_tac b = "inverse x" in mult_strict_right_mono, auto) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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changeset
|
200 |
done |
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replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
9429
diff
changeset
|
201 |
|
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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changeset
|
202 |
lemma reals_Archimedean3: "0 < x ==> \<forall>y. \<exists>(n::nat). y < real n * x" |
3d4df8c166ae
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paulson
parents:
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diff
changeset
|
203 |
apply safe |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
9429
diff
changeset
|
204 |
apply (cut_tac x = "y*inverse (x) " in reals_Archimedean2) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
205 |
apply safe |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
9429
diff
changeset
|
206 |
apply (frule_tac a = "y * inverse x" in mult_strict_right_mono) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
9429
diff
changeset
|
207 |
apply (auto simp add: mult_assoc real_of_nat_def) |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
9429
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changeset
|
208 |
done |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
9429
diff
changeset
|
209 |
|
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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changeset
|
210 |
ML |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
211 |
{* |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
9429
diff
changeset
|
212 |
val real_sum_of_halves = thm "real_sum_of_halves"; |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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changeset
|
213 |
val posreal_complete = thm "posreal_complete"; |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
214 |
val real_isLub_unique = thm "real_isLub_unique"; |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
9429
diff
changeset
|
215 |
val real_order_restrict = thm "real_order_restrict"; |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
216 |
val posreals_complete = thm "posreals_complete"; |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
217 |
val reals_complete = thm "reals_complete"; |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
218 |
val reals_Archimedean = thm "reals_Archimedean"; |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
219 |
val reals_Archimedean2 = thm "reals_Archimedean2"; |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
220 |
val reals_Archimedean3 = thm "reals_Archimedean3"; |
3d4df8c166ae
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paulson
parents:
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changeset
|
221 |
*} |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
222 |
|
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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changeset
|
223 |
end |
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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changeset
|
224 |
|
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
225 |
|
3d4df8c166ae
replacing HOL/Real/PRat, PNat by the rational number development
paulson
parents:
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diff
changeset
|
226 |