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Proof step 5 from proof scale-abs (previous step)

¬ ¬ dec.int < 0 ⊦ mkDecimal(abs(dec.int), dec.scale).scale = dec.scale

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
dec.int < 0 ⊦ mkDecimal(dec.int, dec.scale).scale = dec.scale

Rule argument

Additional information

Used simplifier rules: forward-le-02: ⊦ j < i ∧ i ≤ 0 → j < 0; (forward) from specification int-abs%scale-negate: ⊦ mkDecimal(~ i, j).scale = mkDecimal(i, j).scale; from specification decimal%abs-08: ⊦ i < 0 → abs(i) = ~ i; from specification int-abs