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Proof step 17 from proof eq-leninv (previous step)

m + 1 = nσ[n], ⌜n⌝ < # nσ, stutf(nσ), ∀ nσ, n. m = nσ[n] ∧ ⌜n⌝ < # nσ ∧ stutf(nσ) → nσ[n] = 0 ∨ (⌜nσ[n]⌝ = leninv(nσ) ↔ # nσ = ∞ ∧ (∀ m. n < m ∧ ⌜m⌝ < # nσ → nσ[m] = nσ[n])) ⊦ nσ[n] = 0, ⌜nσ[n]⌝ = leninv(nσ) ↔ # nσ = ∞ ∧ (∀ m. n < m ∧ ⌜m⌝ < # nσ → nσ[m] = nσ[n])

User applied rule weakening

And obtained the following new goals

Rule argument

poslist: left 4

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