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Proof step 5 from proof inv-get-inverse-last (previous step)

⌜n⌝ + ⌜1⌝ = leninv(nσ), stutf(nσ), ⌜((λ m. max∞(λ n. ⌜n⌝ < # nσ ∧ nσ[n] = m).n) to leninv(nσ).n)[n]⌝ + ⌜m⌝ + ⌜1⌝ < # nσ ⊦ nσ[((λ m. max∞(λ n. ⌜n⌝ < # nσ ∧ nσ[n] = m).n) to leninv(nσ).n)[n] + m + 1] = n + 1

User applied rule flip equation

And obtained the following new goals

Proof step 6:
leninv(nσ) = ⌜n⌝ + ⌜1⌝ , stutf(nσ), ⌜((λ m. max∞(λ n. ⌜n⌝ < # nσ ∧ nσ[n] = m).n) to leninv(nσ).n)[n]⌝ + ⌜m⌝ + ⌜1⌝ < # nσ ⊦ nσ[((λ m. max∞(λ n. ⌜n⌝ < # nσ ∧ nσ[n] = m).n) to leninv(nσ).n)[n] + m + 1] = n + 1

Rule argument

pos: left 1

Proof step 5 from proof inv-get-inverse-last (previous step)

User applied rule flip equation

And obtained the following new goals

Rule argument

Additional information