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Proof step 4 from proof size-append (previous step)

⊦ #(⌜x⌝ + ⌜x0⌝ ) = ⌜# x⌝ + # ⌜x0⌝

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
⊦ #(⌜x⌝ + ⌜x0⌝ ) = ⌜# x⌝ + ⌜# x0⌝

Rule argument

Additional information

Used simplifier rules: size-fin: ⊦ # ⌜x⌝ = ⌜# x⌝ ;