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

dec < mkDecimal(0, 0) ⊦ abs(dec) = ~ dec

User applied rule constructor cut

And obtained the following new goals

Proof step 3:
dec = mkDecimal(i, i0), dec < mkDecimal(0, 0) ⊦ abs(dec) = ~ dec

Rule argument

var: dec

Additional information

Used simplifier rules: decimal generated by mkDecimal;;