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Proof step 2 from proof insperm-03 (previous step)

⊦ perm(ins≤(a, x), y) ↔ perm(a ' + x, y)

User applied rule insert lemma

And obtained the following new goals

Proof step 3:
⊦ perm(a ' + x, ins≤(a, x))
Proof step 4:
perm(a ' + x, ins≤(a, x)) ⊦ perm(ins≤(a, x), y) ↔ perm(a ' + x, y)

Rule argument

spec: olist inst: name: insperm seq: ⊦ perm(a ' + x, ins≤(a, x)) subst: [a, x] → [a, x] flags: current, []

Additional information

Used terms: a, x