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Proof step 1 from proof mk-butlast (conclusion)
⊦ m ≠ 0 → (x + mklist(a, m)).butlast = x + mklist(a, m - 1)
Heuristic simplifier applied rule simplifier
And obtained the following new goals
Proof step 2
:
⊦ (x + mklist(a, m)).butlast = x + mklist(a, m - 1), m = 0
Rule argument
Additional information