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Proof step 1 from proof to-unwind-begin (conclusion)

⌜n⌝ < # σ ⊦ σ to n + 1 = σ[0] + (tl(σ) to n)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⌜n⌝ < # σ ⊦ σ to n + 1 = ⌜σ[0] '⌝ + (tl(σ) to n)

Rule argument

Additional information

Used simplifier rules: cons-append: ⊦ a + σ = ⌜a '⌝ + σ;