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Proof step 4 from proof ks-RED1 (previous step)

tn = none ⊦ 〈if tn = none ∧ ap(K) then { RED1(K .1; tn) ; if tn ≠ none then tn := some(tn .t _ K .2) else if value(K .1) then { RED1(K .2; tn) ; if tn ≠ none then tn := some(K .1 _ tn .t) } }〉 tn = none

Heuristic symbolic execution applied rule if negative right

And obtained the following new goals

Proof step 3:
tn = none ⊦ 〈skip〉 tn = none

Rule argument

[fmapos-arg: pos: right 1]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ ap(K)])]]