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Proof step 2 from proof ac-no2 (previous step)

is_indexkey(sk) ⊦ addclass(class, (sk × val) ' + fis, st) = addclass(class, fis, st)

User applied rule structural induction

And obtained the following new goals

Proof step 1:
⊦ addclass(class1, (i ' × val) ' + fis, st) = addclass(class1, fis, st)

Rule argument

[VARWITHFMAVARSARG : sk, ()]

Additional information

[[CONCRETESIMPRULES : ([CSIMPGEN : storekey generated by ', ';], [CSIMPSEQ : ⊦ ¬ is_indexkey(fs ')], [CSIMPSEQ : ⊦ (fis + fis0) + fis1 = fis + fis0 + fis1])]]