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Proof step 2 from proof append-extract-list (previous step)

σ = ⌜x0⌝ , finp(σ) ⊦ (⌜x⌝ + σ).l = x + x0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ (⌜x⌝ + ⌜x0⌝ ).l = x + x0

Rule argument

Additional information

Used simplifier rules: ⊦ finp(⌜x⌝ ); (s)