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Proof step 5 from proof papp-02 (
previous step
)
perm(x0 + y0, x + y), perm(x, x0), perm(x + y, y0 + x0), perm(x0, x), perm(x + y, x0 + y0) ⊦ perm(y, y0)
User applied rule insert rewrite lemma
And obtained the following new goals
Proof step 6
:
⊦ perm(x, x0) → (perm(x + y, x0 + y0) ↔ perm(y, y0))
Rule argument
spec: inst: name: papp-03 seq: ⊦ perm(x, x0) → (perm(x + y, x0 + y0) ↔ perm(y, y0)) subst: [y0, x0, y, x] → [y0, x0, y, x] flags: rewrite, current
Additional information
Used terms: y0, x0, y, x