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Proof step 3 from proof leninv-invlast-2 (
previous step
)
⊦ # nσ = ⌜m⌝ + ⌜1⌝ ∧ leninv(nσ) = ⌜n⌝ + ⌜1⌝ ∧ stutf(nσ) → nσ[m] = n
Lemma
leninv-invlast