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Proof step 3 from proof add-a (previous step)

⊦ mkDecimal(i, i0) + dec1 + dec2 = (mkDecimal(i, i0) + dec1) + dec2

User applied rule constructor cut

And obtained the following new goals

Proof step 4:
dec1 = mkDecimal(i1, i2) ⊦ mkDecimal(i, i0) + dec1 + dec2 = (mkDecimal(i, i0) + dec1) + dec2

Rule argument

var: dec1

Additional information

Used simplifier rules: decimal generated by mkDecimal;;