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Proof step 3 from proof to-to-ls (previous step)

m < n ⊦ σ to n to m = σ to m, # σ < ⌜n⌝

User applied rule apply lemma

And obtained the following new goals

Proof step 4:
¬ # σ < ⌜n⌝ ⊦ m ≤ n → σ to n to m = σ to m

Rule argument

spec: <toplevel> name: to-to-leq seq: ¬ # σ < ⌜n⌝ ⊦ m ≤ n → σ to n to m = σ to m subst: [σ, n, m] → [σ, n, m]

Additional information

Used simplifier rules: ⊦ m < n → m ≤ n; (s) Used terms: σ, n, m