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Proof step 13 from proof elim-fromto (previous step)

# σ0 = ⌜n⌝ , σ0 = ⌜x⌝ , ⌜nf⌝ = σ0 + σ1 ⊦ σ0 = ⌜nf to n⌝ ∧ σ1 = ⌜nf from n⌝

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 14:
⌜nf⌝ = ⌜x⌝ + σ1 ⊦ x = nf to # x ∧ σ1 = ⌜nf from # x⌝

Rule argument

Additional information

Used simplifier rules: size-fin: ⊦ # ⌜x⌝ = ⌜# x⌝ ;% ⊦ ⌜x⌝ = ⌜x0⌝ ↔ x = x0; (s)% ⊦ ⌜m⌝ = ⌜m0⌝ ↔ m = m0; (s)