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Proof step 12 from proof elim-fromto (previous step)

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

User applied rule constructor cut

And obtained the following new goals

Proof step 13:
# σ0 = ⌜n⌝ , σ0 = ⌜x⌝ , ⌜nf⌝ = σ0 + σ1 ⊦ σ0 = ⌜nf to n⌝ ∧ σ1 = ⌜nf from n⌝
Proof step 25:
# σ0 = ⌜n⌝ , σ0 = ⌜nf0⌝ , ⌜nf⌝ = σ0 + σ1 ⊦ σ0 = ⌜nf to n⌝ ∧ σ1 = ⌜nf from n⌝

Rule argument

var: σ0

Additional information

Used simplifier rules: stream freely generated by ⌜ ⌝, ⌜ ⌝;;