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Proof step 24 from proof append-assoc (previous step)

⊦ (⌜x⌝ + ⌜nf⌝ ) + σ2 = ⌜x⌝ + ⌜nf⌝ + σ2

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 25:
⊦ (⌜x⌝ + ⌜nf⌝ ) + σ2 = ⌜x⌝ + ⌜nf⌝

Rule argument

Additional information

Used simplifier rules: append-inf: ⊦ ⌜nf⌝ + σ = ⌜nf⌝ ;