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Proof step 10 from proof sub-add (previous step)

⊦ mkDecimal((i * 10 ^ abs(i2) + i1 * 10 ^ abs(i0)) * 10 ^ abs(i2) - i1 * 10 ^ (abs(i0) + abs(i2)), 2 * abs(i2) + abs(i0)) = mkDecimal(i, i0)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 11:
⊦ mkDecimal(i, j) = mkDecimal(i, abs(j))
Proof step 12:
⊦ mkDecimal((i * 10 ^ abs(i2) + i1 * 10 ^ abs(i0)) * 10 ^ abs(i2) - i1 * 10 ^ (abs(i0) + abs(i2)), 2 * abs(i2) + abs(i0)) = mkDecimal(i, abs(i0))

Rule argument

spec: decimal inst: name: mkDecimal-scale-not-neg seq: ⊦ mkDecimal(i, j) = mkDecimal(i, abs(j)) subst: [j, i] → [i0, i] flags: rewrite

Additional information

Used terms: i0, i