src/HOL/HOL.thy
changeset 60183 4cd4c204578c
parent 60169 5ef8ed685965
child 60758 d8d85a8172b5
     1.1 --- a/src/HOL/HOL.thy	Thu May 07 15:34:28 2015 +0200
     1.2 +++ b/src/HOL/HOL.thy	Sat May 09 12:19:24 2015 +0200
     1.3 @@ -1270,6 +1270,8 @@
     1.4  lemma False_implies_equals: "(False \<Longrightarrow> P) \<equiv> Trueprop True"
     1.5  by default simp_all
     1.6  
     1.7 +(* This is not made a simp rule because it does not improve any proofs
     1.8 +   but slows some AFP entries down by 5% (cpu time). May 2015 *)
     1.9  lemma implies_False_swap: "NO_MATCH (Trueprop False) P \<Longrightarrow>
    1.10    (False \<Longrightarrow> PROP P \<Longrightarrow> PROP Q) \<equiv> (PROP P \<Longrightarrow> False \<Longrightarrow> PROP Q)"
    1.11  by(rule swap_prems_eq)
    1.12 @@ -1297,7 +1299,7 @@
    1.13  lemmas [simp] =
    1.14    triv_forall_equality (*prunes params*)
    1.15    True_implies_equals implies_True_equals (*prune True in asms*)
    1.16 -  False_implies_equals implies_False_swap (*prune False in asms*)
    1.17 +  False_implies_equals (*prune False in asms*)
    1.18    if_True
    1.19    if_False
    1.20    if_cancel