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Proof step 4 from proof mk-butlast (previous step)

⊦ (a ' + mklist(a, m0)).butlast = mklist(a, m0)

User applied rule structural induction

And obtained the following new goals

Proof step 5:
∀ a. (a ' + mklist(a, m)).butlast = mklist(a, m) ⊦ (a ' + mklist(a, m +1)).butlast = mklist(a, m +1)

Rule argument

indvar: m0

Additional information

Used simplifier rules: mk-zero: ⊦ mklist(a, 0) = [];%b: ⊦ a '.butlast = [];%nat freely generated by 0, +1;;%app: ⊦ x + [] = x; from specification list%a: ⊦ (x + y) + z = x + y + z; from specification list