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Proof step 3 from proof perm-01 (previous step)

perm(a ' + sort(x), a ' + x) ⊦ perm(a ' + sort(x), y) ↔ perm(a ' + x, y)

User applied rule case distinction

And obtained the following new goals

Proof step 4:
perm(a ' + sort(x), a ' + x), perm(a ' + sort(x), y) ⊦ perm(a ' + x, y)
Proof step 8:
perm(a ' + sort(x), a ' + x), perm(a ' + x, y) ⊦ perm(a ' + sort(x), y)

Rule argument

pos: right 1

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