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Proof step 3 from proof prefixn-to-adrs (previous step)

⊦ (n ≤ # lax.to-adr(m) ⊃ firstn(n, lax.to-adr(m));lax.to-adr(m)) = prefixn(n, lax).to-adr(m)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
⊦ (n ≤ # lax ⊃ firstn(n, lax.to-adr(m));lax.to-adr(m)) = prefixn(n, lax).to-adr(m)

Rule argument

Additional information

Used simplifier rules: addresslist-length: ⊦ # lax.to-adr(n) = # lax;