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Proof step 7 from proof lsleninv-1 (previous step)

⌜0⌝ = leninv(nσ), n < nσ[m], ⌜m⌝ < # nσ, stutf(nσ) ⊦

User applied rule flip equation

And obtained the following new goals

Proof step 8:
leninv(nσ) = ⌜0⌝ , ⌜m⌝ < # nσ, n < nσ[m], stutf(nσ) ⊦

Rule argument

pos: left 1

Additional information