(* Title: HOL/Hyperreal/HyperBin.ML
ID: $Id$
Author: Lawrence C Paulson, Cambridge University Computer Laboratory
Copyright 2000 University of Cambridge
Binary arithmetic for the hypreals (integer literals only).
*)
(** hypreal_of_real (coercion from int to real) **)
Goal "hypreal_of_real (number_of w) = number_of w";
by (simp_tac (simpset() addsimps [hypreal_number_of_def]) 1);
qed "hypreal_number_of";
Addsimps [hypreal_number_of];
Goalw [hypreal_number_of_def] "(0::hypreal) = #0";
by (simp_tac (simpset() addsimps [hypreal_of_real_zero RS sym]) 1);
qed "zero_eq_numeral_0";
Goalw [hypreal_number_of_def] "1hr = #1";
by (simp_tac (simpset() addsimps [hypreal_of_real_one RS sym]) 1);
qed "one_eq_numeral_1";
(** Addition **)
Goal "(number_of v :: hypreal) + number_of v' = number_of (bin_add v v')";
by (simp_tac
(HOL_ss addsimps [hypreal_number_of_def,
hypreal_of_real_add RS sym, add_real_number_of]) 1);
qed "add_hypreal_number_of";
Addsimps [add_hypreal_number_of];
(** Subtraction **)
Goalw [hypreal_number_of_def]
"- (number_of w :: hypreal) = number_of (bin_minus w)";
by (simp_tac
(HOL_ss addsimps [minus_real_number_of, hypreal_of_real_minus RS sym]) 1);
qed "minus_hypreal_number_of";
Addsimps [minus_hypreal_number_of];
Goalw [hypreal_number_of_def, hypreal_diff_def]
"(number_of v :: hypreal) - number_of w = \
\ number_of (bin_add v (bin_minus w))";
by (Simp_tac 1);
qed "diff_hypreal_number_of";
Addsimps [diff_hypreal_number_of];
(** Multiplication **)
Goal "(number_of v :: hypreal) * number_of v' = number_of (bin_mult v v')";
by (simp_tac
(HOL_ss addsimps [hypreal_number_of_def,
hypreal_of_real_mult RS sym, mult_real_number_of]) 1);
qed "mult_hypreal_number_of";
Addsimps [mult_hypreal_number_of];
Goal "(#2::hypreal) = #1 + #1";
by (Simp_tac 1);
val lemma = result();
(*For specialist use: NOT as default simprules*)
Goal "#2 * z = (z+z::hypreal)";
by (simp_tac (simpset ()
addsimps [lemma, hypreal_add_mult_distrib,
one_eq_numeral_1 RS sym]) 1);
qed "hypreal_mult_2";
Goal "z * #2 = (z+z::hypreal)";
by (stac hypreal_mult_commute 1 THEN rtac hypreal_mult_2 1);
qed "hypreal_mult_2_right";
(*** Comparisons ***)
(** Equals (=) **)
Goal "((number_of v :: hypreal) = number_of v') = \
\ iszero (number_of (bin_add v (bin_minus v')))";
by (simp_tac
(HOL_ss addsimps [hypreal_number_of_def,
hypreal_of_real_eq_iff, eq_real_number_of]) 1);
qed "eq_hypreal_number_of";
Addsimps [eq_hypreal_number_of];
(** Less-than (<) **)
(*"neg" is used in rewrite rules for binary comparisons*)
Goal "((number_of v :: hypreal) < number_of v') = \
\ neg (number_of (bin_add v (bin_minus v')))";
by (simp_tac
(HOL_ss addsimps [hypreal_number_of_def, hypreal_of_real_less_iff,
less_real_number_of]) 1);
qed "less_hypreal_number_of";
Addsimps [less_hypreal_number_of];
(** Less-than-or-equals (<=) **)
Goal "(number_of x <= (number_of y::hypreal)) = \
\ (~ number_of y < (number_of x::hypreal))";
by (rtac (linorder_not_less RS sym) 1);
qed "le_hypreal_number_of_eq_not_less";
Addsimps [le_hypreal_number_of_eq_not_less];
(*** New versions of existing theorems involving 0, 1hr ***)
Goal "- #1 = (#-1::hypreal)";
by (Simp_tac 1);
qed "minus_numeral_one";
(*Maps 0 to #0 and 1hr to #1 and -1hr to #-1*)
val hypreal_numeral_ss =
real_numeral_ss addsimps [zero_eq_numeral_0, one_eq_numeral_1,
minus_numeral_one];
fun rename_numerals th =
asm_full_simplify hypreal_numeral_ss (Thm.transfer (the_context ()) th);
(*Now insert some identities previously stated for 0 and 1hr*)
(** HyperDef **)
Addsimps (map rename_numerals
[hypreal_minus_zero, hypreal_minus_zero_iff,
hypreal_add_zero_left, hypreal_add_zero_right,
hypreal_diff_zero, hypreal_diff_zero_right,
hypreal_mult_0_right, hypreal_mult_0,
hypreal_mult_1_right, hypreal_mult_1,
hypreal_inverse_1, hypreal_minus_zero_less_iff]);
bind_thm ("hypreal_0_less_mult_iff",
rename_numerals hypreal_zero_less_mult_iff);
bind_thm ("hypreal_0_le_mult_iff",
rename_numerals hypreal_zero_le_mult_iff);
bind_thm ("hypreal_mult_less_0_iff",
rename_numerals hypreal_mult_less_zero_iff);
bind_thm ("hypreal_mult_le_0_iff",
rename_numerals hypreal_mult_le_zero_iff);
bind_thm ("hypreal_inverse_less_0", rename_numerals hypreal_inverse_less_zero);
bind_thm ("hypreal_inverse_gt_0", rename_numerals hypreal_inverse_gt_zero);
Addsimps [zero_eq_numeral_0,one_eq_numeral_1];
(** Simplification of arithmetic when nested to the right **)
Goal "number_of v + (number_of w + z) = (number_of(bin_add v w) + z::hypreal)";
by Auto_tac;
qed "hypreal_add_number_of_left";
Goal "number_of v *(number_of w * z) = (number_of(bin_mult v w) * z::hypreal)";
by (simp_tac (simpset() addsimps [hypreal_mult_assoc RS sym]) 1);
qed "hypreal_mult_number_of_left";
Goalw [hypreal_diff_def]
"number_of v + (number_of w - c) = number_of(bin_add v w) - (c::hypreal)";
by (rtac hypreal_add_number_of_left 1);
qed "hypreal_add_number_of_diff1";
Goal "number_of v + (c - number_of w) = \
\ number_of (bin_add v (bin_minus w)) + (c::hypreal)";
by (stac (diff_hypreal_number_of RS sym) 1);
by Auto_tac;
qed "hypreal_add_number_of_diff2";
Addsimps [hypreal_add_number_of_left, hypreal_mult_number_of_left,
hypreal_add_number_of_diff1, hypreal_add_number_of_diff2];
(*"neg" is used in rewrite rules for binary comparisons*)
Goal "hypreal_of_nat (number_of v :: nat) = \
\ (if neg (number_of v) then #0 \
\ else (number_of v :: hypreal))";
by (simp_tac (simpset() addsimps [hypreal_of_nat_real_of_nat]) 1);
qed "hypreal_of_nat_number_of";
Addsimps [hypreal_of_nat_number_of];
(**** Simprocs for numeric literals ****)
(** Combining of literal coefficients in sums of products **)
Goal "(x < y) = (x-y < (#0::hypreal))";
by (simp_tac (simpset() addsimps [hypreal_diff_less_eq]) 1);
qed "hypreal_less_iff_diff_less_0";
Goal "(x = y) = (x-y = (#0::hypreal))";
by (simp_tac (simpset() addsimps [hypreal_diff_eq_eq]) 1);
qed "hypreal_eq_iff_diff_eq_0";
Goal "(x <= y) = (x-y <= (#0::hypreal))";
by (simp_tac (simpset() addsimps [hypreal_diff_le_eq]) 1);
qed "hypreal_le_iff_diff_le_0";
(** For combine_numerals **)
Goal "i*u + (j*u + k) = (i+j)*u + (k::hypreal)";
by (asm_simp_tac (simpset() addsimps [hypreal_add_mult_distrib]) 1);
qed "left_hypreal_add_mult_distrib";
(** For cancel_numerals **)
val rel_iff_rel_0_rls =
map (inst "y" "?u+?v")
[hypreal_less_iff_diff_less_0, hypreal_eq_iff_diff_eq_0,
hypreal_le_iff_diff_le_0] @
map (inst "y" "n")
[hypreal_less_iff_diff_less_0, hypreal_eq_iff_diff_eq_0,
hypreal_le_iff_diff_le_0];
Goal "!!i::hypreal. (i*u + m = j*u + n) = ((i-j)*u + m = n)";
by (asm_simp_tac
(simpset() addsimps [hypreal_diff_def, hypreal_add_mult_distrib]@
hypreal_add_ac@rel_iff_rel_0_rls) 1);
qed "hypreal_eq_add_iff1";
Goal "!!i::hypreal. (i*u + m = j*u + n) = (m = (j-i)*u + n)";
by (asm_simp_tac
(simpset() addsimps [hypreal_diff_def, hypreal_add_mult_distrib]@
hypreal_add_ac@rel_iff_rel_0_rls) 1);
qed "hypreal_eq_add_iff2";
Goal "!!i::hypreal. (i*u + m < j*u + n) = ((i-j)*u + m < n)";
by (asm_simp_tac
(simpset() addsimps [hypreal_diff_def, hypreal_add_mult_distrib]@
hypreal_add_ac@rel_iff_rel_0_rls) 1);
qed "hypreal_less_add_iff1";
Goal "!!i::hypreal. (i*u + m < j*u + n) = (m < (j-i)*u + n)";
by (asm_simp_tac
(simpset() addsimps [hypreal_diff_def, hypreal_add_mult_distrib]@
hypreal_add_ac@rel_iff_rel_0_rls) 1);
qed "hypreal_less_add_iff2";
Goal "!!i::hypreal. (i*u + m <= j*u + n) = ((i-j)*u + m <= n)";
by (asm_simp_tac
(simpset() addsimps [hypreal_diff_def, hypreal_add_mult_distrib]@
hypreal_add_ac@rel_iff_rel_0_rls) 1);
qed "hypreal_le_add_iff1";
Goal "!!i::hypreal. (i*u + m <= j*u + n) = (m <= (j-i)*u + n)";
by (asm_simp_tac
(simpset() addsimps [hypreal_diff_def, hypreal_add_mult_distrib]@
hypreal_add_ac@rel_iff_rel_0_rls) 1);
qed "hypreal_le_add_iff2";
Goal "(z::hypreal) * #-1 = -z";
by (stac (minus_numeral_one RS sym) 1);
by (stac (hypreal_minus_mult_eq2 RS sym) 1);
by Auto_tac;
qed "hypreal_mult_minus_1_right";
Addsimps [hypreal_mult_minus_1_right];
Goal "#-1 * (z::hypreal) = -z";
by (simp_tac (simpset() addsimps [hypreal_mult_commute]) 1);
qed "hypreal_mult_minus_1";
Addsimps [hypreal_mult_minus_1];
structure Hyperreal_Numeral_Simprocs =
struct
(*Utilities*)
val hyprealT = Type("HyperDef.hypreal",[]);
fun mk_numeral n = HOLogic.number_of_const hyprealT $ HOLogic.mk_bin n;
val dest_numeral = Real_Numeral_Simprocs.dest_numeral;
val find_first_numeral = Real_Numeral_Simprocs.find_first_numeral;
val zero = mk_numeral 0;
val mk_plus = HOLogic.mk_binop "op +";
val uminus_const = Const ("uminus", hyprealT --> hyprealT);
(*Thus mk_sum[t] yields t+#0; longer sums don't have a trailing zero*)
fun mk_sum [] = zero
| mk_sum [t,u] = mk_plus (t, u)
| mk_sum (t :: ts) = mk_plus (t, mk_sum ts);
(*this version ALWAYS includes a trailing zero*)
fun long_mk_sum [] = zero
| long_mk_sum (t :: ts) = mk_plus (t, mk_sum ts);
val dest_plus = HOLogic.dest_bin "op +" hyprealT;
(*decompose additions AND subtractions as a sum*)
fun dest_summing (pos, Const ("op +", _) $ t $ u, ts) =
dest_summing (pos, t, dest_summing (pos, u, ts))
| dest_summing (pos, Const ("op -", _) $ t $ u, ts) =
dest_summing (pos, t, dest_summing (not pos, u, ts))
| dest_summing (pos, t, ts) =
if pos then t::ts else uminus_const$t :: ts;
fun dest_sum t = dest_summing (true, t, []);
val mk_diff = HOLogic.mk_binop "op -";
val dest_diff = HOLogic.dest_bin "op -" hyprealT;
val one = mk_numeral 1;
val mk_times = HOLogic.mk_binop "op *";
fun mk_prod [] = one
| mk_prod [t] = t
| mk_prod (t :: ts) = if t = one then mk_prod ts
else mk_times (t, mk_prod ts);
val dest_times = HOLogic.dest_bin "op *" hyprealT;
fun dest_prod t =
let val (t,u) = dest_times t
in dest_prod t @ dest_prod u end
handle TERM _ => [t];
(*DON'T do the obvious simplifications; that would create special cases*)
fun mk_coeff (k, ts) = mk_times (mk_numeral k, ts);
(*Express t as a product of (possibly) a numeral with other sorted terms*)
fun dest_coeff sign (Const ("uminus", _) $ t) = dest_coeff (~sign) t
| dest_coeff sign t =
let val ts = sort Term.term_ord (dest_prod t)
val (n, ts') = find_first_numeral [] ts
handle TERM _ => (1, ts)
in (sign*n, mk_prod ts') end;
(*Find first coefficient-term THAT MATCHES u*)
fun find_first_coeff past u [] = raise TERM("find_first_coeff", [])
| find_first_coeff past u (t::terms) =
let val (n,u') = dest_coeff 1 t
in if u aconv u' then (n, rev past @ terms)
else find_first_coeff (t::past) u terms
end
handle TERM _ => find_first_coeff (t::past) u terms;
(*Simplify #1*n and n*#1 to n*)
val add_0s = map rename_numerals
[hypreal_add_zero_left, hypreal_add_zero_right];
val mult_plus_1s = map rename_numerals
[hypreal_mult_1, hypreal_mult_1_right];
val mult_minus_1s = map rename_numerals
[hypreal_mult_minus_1, hypreal_mult_minus_1_right];
val mult_1s = mult_plus_1s @ mult_minus_1s;
(*To perform binary arithmetic*)
val bin_simps =
[add_hypreal_number_of, hypreal_add_number_of_left,
minus_hypreal_number_of, diff_hypreal_number_of, mult_hypreal_number_of,
hypreal_mult_number_of_left] @ bin_arith_simps @ bin_rel_simps;
(*To evaluate binary negations of coefficients*)
val hypreal_minus_simps = NCons_simps @
[minus_hypreal_number_of,
bin_minus_1, bin_minus_0, bin_minus_Pls, bin_minus_Min,
bin_pred_1, bin_pred_0, bin_pred_Pls, bin_pred_Min];
(*To let us treat subtraction as addition*)
val diff_simps = [hypreal_diff_def, hypreal_minus_add_distrib,
hypreal_minus_minus];
(*push the unary minus down: - x * y = x * - y *)
val hypreal_minus_mult_eq_1_to_2 =
[hypreal_minus_mult_eq1 RS sym, hypreal_minus_mult_eq2] MRS trans
|> standard;
(*to extract again any uncancelled minuses*)
val hypreal_minus_from_mult_simps =
[hypreal_minus_minus, hypreal_minus_mult_eq1 RS sym,
hypreal_minus_mult_eq2 RS sym];
(*combine unary minus with numeric literals, however nested within a product*)
val hypreal_mult_minus_simps =
[hypreal_mult_assoc, hypreal_minus_mult_eq1, hypreal_minus_mult_eq_1_to_2];
(*Apply the given rewrite (if present) just once*)
fun trans_tac None = all_tac
| trans_tac (Some th) = ALLGOALS (rtac (th RS trans));
fun prove_conv name tacs sg (hyps: thm list) (t,u) =
if t aconv u then None
else
let val ct = cterm_of sg (HOLogic.mk_Trueprop (HOLogic.mk_eq (t, u)))
in Some
(prove_goalw_cterm [] ct (K tacs)
handle ERROR => error
("The error(s) above occurred while trying to prove " ^
string_of_cterm ct ^ "\nInternal failure of simproc " ^ name))
end;
(*version without the hyps argument*)
fun prove_conv_nohyps name tacs sg = prove_conv name tacs sg [];
(*Final simplification: cancel + and * *)
val simplify_meta_eq =
Int_Numeral_Simprocs.simplify_meta_eq
[hypreal_add_zero_left, hypreal_add_zero_right,
hypreal_mult_0, hypreal_mult_0_right, hypreal_mult_1,
hypreal_mult_1_right];
val prep_simproc = Real_Numeral_Simprocs.prep_simproc;
val prep_pats = map Real_Numeral_Simprocs.prep_pat;
structure CancelNumeralsCommon =
struct
val mk_sum = mk_sum
val dest_sum = dest_sum
val mk_coeff = mk_coeff
val dest_coeff = dest_coeff 1
val find_first_coeff = find_first_coeff []
val trans_tac = trans_tac
val norm_tac =
ALLGOALS (simp_tac (HOL_ss addsimps add_0s@mult_1s@diff_simps@
hypreal_minus_simps@hypreal_add_ac))
THEN ALLGOALS (simp_tac (HOL_ss addsimps bin_simps@hypreal_mult_minus_simps))
THEN ALLGOALS
(simp_tac (HOL_ss addsimps hypreal_minus_from_mult_simps@
hypreal_add_ac@hypreal_mult_ac))
val numeral_simp_tac = ALLGOALS (simp_tac (HOL_ss addsimps add_0s@bin_simps))
val simplify_meta_eq = simplify_meta_eq
end;
structure EqCancelNumerals = CancelNumeralsFun
(open CancelNumeralsCommon
val prove_conv = prove_conv "hyprealeq_cancel_numerals"
val mk_bal = HOLogic.mk_eq
val dest_bal = HOLogic.dest_bin "op =" hyprealT
val bal_add1 = hypreal_eq_add_iff1 RS trans
val bal_add2 = hypreal_eq_add_iff2 RS trans
);
structure LessCancelNumerals = CancelNumeralsFun
(open CancelNumeralsCommon
val prove_conv = prove_conv "hyprealless_cancel_numerals"
val mk_bal = HOLogic.mk_binrel "op <"
val dest_bal = HOLogic.dest_bin "op <" hyprealT
val bal_add1 = hypreal_less_add_iff1 RS trans
val bal_add2 = hypreal_less_add_iff2 RS trans
);
structure LeCancelNumerals = CancelNumeralsFun
(open CancelNumeralsCommon
val prove_conv = prove_conv "hyprealle_cancel_numerals"
val mk_bal = HOLogic.mk_binrel "op <="
val dest_bal = HOLogic.dest_bin "op <=" hyprealT
val bal_add1 = hypreal_le_add_iff1 RS trans
val bal_add2 = hypreal_le_add_iff2 RS trans
);
val cancel_numerals =
map prep_simproc
[("hyprealeq_cancel_numerals",
prep_pats ["(l::hypreal) + m = n", "(l::hypreal) = m + n",
"(l::hypreal) - m = n", "(l::hypreal) = m - n",
"(l::hypreal) * m = n", "(l::hypreal) = m * n"],
EqCancelNumerals.proc),
("hyprealless_cancel_numerals",
prep_pats ["(l::hypreal) + m < n", "(l::hypreal) < m + n",
"(l::hypreal) - m < n", "(l::hypreal) < m - n",
"(l::hypreal) * m < n", "(l::hypreal) < m * n"],
LessCancelNumerals.proc),
("hyprealle_cancel_numerals",
prep_pats ["(l::hypreal) + m <= n", "(l::hypreal) <= m + n",
"(l::hypreal) - m <= n", "(l::hypreal) <= m - n",
"(l::hypreal) * m <= n", "(l::hypreal) <= m * n"],
LeCancelNumerals.proc)];
structure CombineNumeralsData =
struct
val add = op + : int*int -> int
val mk_sum = long_mk_sum (*to work for e.g. #2*x + #3*x *)
val dest_sum = dest_sum
val mk_coeff = mk_coeff
val dest_coeff = dest_coeff 1
val left_distrib = left_hypreal_add_mult_distrib RS trans
val prove_conv = prove_conv_nohyps "hypreal_combine_numerals"
val trans_tac = trans_tac
val norm_tac =
ALLGOALS (simp_tac (HOL_ss addsimps add_0s@mult_1s@diff_simps@
hypreal_minus_simps@hypreal_add_ac))
THEN ALLGOALS (simp_tac (HOL_ss addsimps bin_simps@hypreal_mult_minus_simps))
THEN ALLGOALS (simp_tac (HOL_ss addsimps hypreal_minus_from_mult_simps@
hypreal_add_ac@hypreal_mult_ac))
val numeral_simp_tac = ALLGOALS
(simp_tac (HOL_ss addsimps add_0s@bin_simps))
val simplify_meta_eq = simplify_meta_eq
end;
structure CombineNumerals = CombineNumeralsFun(CombineNumeralsData);
val combine_numerals =
prep_simproc ("hypreal_combine_numerals",
prep_pats ["(i::hypreal) + j", "(i::hypreal) - j"],
CombineNumerals.proc);
(** Declarations for ExtractCommonTerm **)
(*this version ALWAYS includes a trailing one*)
fun long_mk_prod [] = one
| long_mk_prod (t :: ts) = mk_times (t, mk_prod ts);
(*Find first term that matches u*)
fun find_first past u [] = raise TERM("find_first", [])
| find_first past u (t::terms) =
if u aconv t then (rev past @ terms)
else find_first (t::past) u terms
handle TERM _ => find_first (t::past) u terms;
(*Final simplification: cancel + and * *)
fun cancel_simplify_meta_eq cancel_th th =
Int_Numeral_Simprocs.simplify_meta_eq
[hypreal_mult_1, hypreal_mult_1_right]
(([th, cancel_th]) MRS trans);
end;
Addsimprocs Hyperreal_Numeral_Simprocs.cancel_numerals;
Addsimprocs [Hyperreal_Numeral_Simprocs.combine_numerals];
(*The Abel_Cancel simprocs are now obsolete*)
Delsimprocs [Hyperreal_Cancel.sum_conv, Hyperreal_Cancel.rel_conv];
(*examples:
print_depth 22;
set timing;
set trace_simp;
fun test s = (Goal s, by (Simp_tac 1));
test "l + #2 + #2 + #2 + (l + #2) + (oo + #2) = (uu::hypreal)";
test "#2*u = (u::hypreal)";
test "(i + j + #12 + (k::hypreal)) - #15 = y";
test "(i + j + #12 + (k::hypreal)) - #5 = y";
test "y - b < (b::hypreal)";
test "y - (#3*b + c) < (b::hypreal) - #2*c";
test "(#2*x - (u*v) + y) - v*#3*u = (w::hypreal)";
test "(#2*x*u*v + (u*v)*#4 + y) - v*u*#4 = (w::hypreal)";
test "(#2*x*u*v + (u*v)*#4 + y) - v*u = (w::hypreal)";
test "u*v - (x*u*v + (u*v)*#4 + y) = (w::hypreal)";
test "(i + j + #12 + (k::hypreal)) = u + #15 + y";
test "(i + j*#2 + #12 + (k::hypreal)) = j + #5 + y";
test "#2*y + #3*z + #6*w + #2*y + #3*z + #2*u = #2*y' + #3*z' + #6*w' + #2*y' + #3*z' + u + (vv::hypreal)";
test "a + -(b+c) + b = (d::hypreal)";
test "a + -(b+c) - b = (d::hypreal)";
(*negative numerals*)
test "(i + j + #-2 + (k::hypreal)) - (u + #5 + y) = zz";
test "(i + j + #-3 + (k::hypreal)) < u + #5 + y";
test "(i + j + #3 + (k::hypreal)) < u + #-6 + y";
test "(i + j + #-12 + (k::hypreal)) - #15 = y";
test "(i + j + #12 + (k::hypreal)) - #-15 = y";
test "(i + j + #-12 + (k::hypreal)) - #-15 = y";
*)
(** Constant folding for hypreal plus and times **)
(*We do not need
structure Hyperreal_Plus_Assoc = Assoc_Fold (Hyperreal_Plus_Assoc_Data);
because combine_numerals does the same thing*)
structure Hyperreal_Times_Assoc_Data : ASSOC_FOLD_DATA =
struct
val ss = HOL_ss
val eq_reflection = eq_reflection
val sg_ref = Sign.self_ref (Theory.sign_of (the_context ()))
val T = Hyperreal_Numeral_Simprocs.hyprealT
val plus = Const ("op *", [T,T] ---> T)
val add_ac = hypreal_mult_ac
end;
structure Hyperreal_Times_Assoc = Assoc_Fold (Hyperreal_Times_Assoc_Data);
Addsimprocs [Hyperreal_Times_Assoc.conv];
Addsimps [rename_numerals hypreal_of_real_zero_iff];
(*Simplification of x-y < 0, etc.*)
AddIffs [hypreal_less_iff_diff_less_0 RS sym];
AddIffs [hypreal_eq_iff_diff_eq_0 RS sym];
AddIffs [hypreal_le_iff_diff_le_0 RS sym];
(** number_of related to hypreal_of_real **)
Goal "(number_of w < hypreal_of_real z) = (number_of w < z)";
by (stac (hypreal_of_real_less_iff RS sym) 1);
by (Simp_tac 1);
qed "number_of_less_hypreal_of_real_iff";
Addsimps [number_of_less_hypreal_of_real_iff];
Goal "(number_of w <= hypreal_of_real z) = (number_of w <= z)";
by (stac (hypreal_of_real_le_iff RS sym) 1);
by (Simp_tac 1);
qed "number_of_le_hypreal_of_real_iff";
Addsimps [number_of_le_hypreal_of_real_iff];
Goal "(hypreal_of_real z < number_of w) = (z < number_of w)";
by (stac (hypreal_of_real_less_iff RS sym) 1);
by (Simp_tac 1);
qed "hypreal_of_real_less_number_of_iff";
Addsimps [hypreal_of_real_less_number_of_iff];
Goal "(hypreal_of_real z <= number_of w) = (z <= number_of w)";
by (stac (hypreal_of_real_le_iff RS sym) 1);
by (Simp_tac 1);
qed "hypreal_of_real_le_number_of_iff";
Addsimps [hypreal_of_real_le_number_of_iff];