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Proof step 3 from proof cons-extract-list (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
⊦ (⌜a '⌝ + ⌜x⌝ ).l = a ' + x

Rule argument

Additional information

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