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Proof step 2 from proof mk-tail-01 (previous step)

⊦ (mklist(a, m) + x).tail = mklist(a, m -1) + x, m = 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ (mklist(a, m) + x).tail = mklist(a, m - 1) + x, m = 0

Rule argument

Additional information

Used simplifier rules: ⊦ n -1 = n - 1; (s)