1 (* theory collecting all knowledge for Root
9 (* use_thy_only"Knowledge/Root";
11 use_thy"Knowledge/Isac";
15 (*-------------------- consts------------------------------------------------*)
18 sqrt :: "real => real" (*"(sqrt _ )" [80] 80*)
19 nroot :: "[real, real] => real"
21 (*----------------------scripts-----------------------*)
23 (*-------------------- rules------------------------------------------------*)
24 rules (*.not contained in Isabelle2002,
25 stated as axioms, TODO: prove as theorems;
26 theorem-IDs 'xxxI' with ^^^ instead of ^ in 'xxx' in Isabelle2002.*)
28 root_plus_minus "0 <= b ==> \
29 \(a^^^2 = b) = ((a = sqrt b) | (a = (-1)*sqrt b))"
30 root_false "b < 0 ==> (a^^^2 = b) = False"
32 (* for expand_rootbinom *)
33 real_pp_binom_times "(a + b)*(c + d) = a*c + a*d + b*c + b*d"
34 real_pm_binom_times "(a + b)*(c - d) = a*c - a*d + b*c - b*d"
35 real_mp_binom_times "(a - b)*(c + d) = a*c + a*d - b*c - b*d"
36 real_mm_binom_times "(a - b)*(c - d) = a*c - a*d - b*c + b*d"
37 real_plus_binom_pow3 "(a + b)^^^3 = a^^^3 + 3*a^^^2*b + 3*a*b^^^2 + b^^^3"
38 real_minus_binom_pow3 "(a - b)^^^3 = a^^^3 - 3*a^^^2*b + 3*a*b^^^2 - b^^^3"
39 realpow_mul "(a*b)^^^n = a^^^n * b^^^n"
41 real_diff_minus "a - b = a + (-1) * b"
42 real_plus_binom_times "(a + b)*(a + b) = a^^^2 + 2*a*b + b^^^2"
43 real_minus_binom_times "(a - b)*(a - b) = a^^^2 - 2*a*b + b^^^2"
44 real_plus_binom_pow2 "(a + b)^^^2 = a^^^2 + 2*a*b + b^^^2"
45 real_minus_binom_pow2 "(a - b)^^^2 = a^^^2 - 2*a*b + b^^^2"
46 real_plus_minus_binom1 "(a + b)*(a - b) = a^^^2 - b^^^2"
47 real_plus_minus_binom2 "(a - b)*(a + b) = a^^^2 - b^^^2"
49 real_root_positive "0 <= a ==> (x ^^^ 2 = a) = (x = sqrt a)"
50 real_root_negative "a < 0 ==> (x ^^^ 2 = a) = False"