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

a ∈ mklist(b, n0 +1), ∀ a, b. a ∈ mklist(b, n0) → a = b ⊦ a = b

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
a ∈ mklist(b, n0 + 1), ∀ a, b. a ∈ mklist(b, n0) → a = b ⊦ a = b

Rule argument

Additional information

Used simplifier rules: ⊦ m +1 = m + 1; (s)