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Proof step 3 from proof size-rec-rem (previous step)

adr = @(m, m0, m1) ⊦ (as ++ adr).size = (as.size - (adr ∈ as ⊃ m1;0)) + m1

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
⊦ (as ++ @(m, m0, m1)).size = (as.size - (@(m, m0, m1) ∈ as ⊃ m1;0)) + m1

Rule argument

Additional information