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Proof step 4 from proof enc-zero (previous step)

i = 0, j = 0 ⊦ encode(encode(encode(i), encode(j))) = 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
⊦ encode(0) = 0

Rule argument

Additional information

Used simplifier rules: enc-int-pos: ⊦ 0 ≤ i → encode(i) = 2 * i→n(i);% ⊦ encode(0, 0) = 0; (s)