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Proof step 3 from proof mult-one (previous step)

⊦ dec_i * mkDecimal(1, 0) = dec_i

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ dec_i * dec_j = mkDecimal(dec_i.int * dec_j.int, dec_i.scale + dec_j.scale)
Proof step 5:
⊦ mkDecimal(dec_i.int * mkDecimal(1, 0).int, dec_i.scale + mkDecimal(1, 0).scale) = dec_i

Rule argument

spec: inst: name: mult-def seq: ⊦ dec_i * dec_j = mkDecimal(dec_i.int * dec_j.int, dec_i.scale + dec_j.scale) subst: [dec_j, dec_i] → [mkDecimal(1, 0), dec_i] flags: rewrite, current

Additional information

Used terms: mkDecimal(1, 0), dec_i