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Proof step 2 from proof getint-neg (previous step)

true, ∀ i0, j. i→n(i0) < i→n(i) → true → ~ mkDecimal(i0, j).int = mkDecimal(~ i0, j).int ⊦ ~ mkDecimal(i, j).int = mkDecimal(~ i, j).int

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
∀ i0, j. i→n(i0) < i→n(i) → true → ~ mkDecimal(i0, j).int = mkDecimal(~ i0, j).int ⊦ mkDecimal(i, j).int + mkDecimal(~ i, j).int = 0

Rule argument

Additional information

Used simplifier rules: negeq: ⊦ ~ i = j ↔ i + j = 0; from specification int-abs