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Proof step 2 from proof papp (previous step)

perm(y, y0), perm(x, x0) ⊦ perm(x + y, x0 + y0)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: perm: ⊦ perm(x, y) ↔ x ⊆m y ∧ y ⊆m x;%subapp: ⊦ x ⊆m x0 ∧ y ⊆m y0 → x + y ⊆m x0 + y0;%a: ⊦ (x + y) + z = x + y + z; from specification list