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Proof step 1 from proof sub-add (conclusion)

⊦ dec_i + dec_j - dec_j = dec_i

User applied rule constructor cut

And obtained the following new goals

Proof step 2:
dec_i = mkDecimal(i, i0) ⊦ dec_i + dec_j - dec_j = dec_i

Rule argument

var: dec_i

Additional information

Used simplifier rules: decimal generated by mkDecimal;;