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Proof step 1 from proof papp-01 (conclusion)

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

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: perm-def: ⊦ perm(x, y) ↔ ¬ ¬(x ⊆m y ∧ y ⊆m x);%subapp-01: ⊦ x ⊆m x0 ∧ y ⊆m y0 → y + x ⊆m x0 + y0;%a: ⊦ (x + y) + z = x + y + z; from specification list