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Proof step 11 from proof countrefs-not-zero-01 (previous step)

countrefs(ints0) ≠ 0, countrefs(i + ints0) = 0 ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 10:
countrefs(i ' + ints0) = 0 ⊦ countrefs(ints0) = 0

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ i + ints = i ' + ints])]]