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Proof step 11 from proof lsleninv-1 (previous step)

⌜m1⌝ + ⌜1⌝ = leninv(nσ), m1 < nσ[m], ⌜m⌝ < # nσ, n < nσ[m], m1 < n, m1 + 1 < nσ[m], stutf(nσ) ⊦

User applied rule flip equation

And obtained the following new goals

Proof step 12:
leninv(nσ) = ⌜m1⌝ + ⌜1⌝ , m1 + 1 < nσ[m], m1 < n, n < nσ[m], ⌜m⌝ < # nσ, m1 < nσ[m], stutf(nσ) ⊦

Rule argument

pos: left 1

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