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Proof step 1 from proof p-fr (conclusion)

a + x = y ⊦ a = y.first ∧ x = y.rest

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: sel-1: ⊦ (a + x).first = a;%sel-2: ⊦ (a + x).rest = x;