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Proof step 1 from proof add-a (conclusion)

⊦ dec0 + dec1 + dec2 = (dec0 + dec1) + dec2

User applied rule constructor cut

And obtained the following new goals

Proof step 2:
dec0 = mkDecimal(i, i0) ⊦ dec0 + dec1 + dec2 = (dec0 + dec1) + dec2

Rule argument

var: dec0

Additional information

Used simplifier rules: decimal generated by mkDecimal;;