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Proof step 17 from proof countrefs-ls (previous step)

countrefs(i ' + ints) < countrefs(ints), 0 < i ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ # ints ≤ 1 → countrefs(ints) = 1
Proof step 13:
¬ # (i ' + ints) ≤ 1, countrefs(i ' + ints) < countrefs(ints), 0 < i ⊦
Proof step 16:
# (i ' + ints) ≤ 1, 1 < countrefs(ints), 0 < i ⊦

Rule argument

[crewrite-arg: countrefs-base, F, [ints] → [i ' + ints]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (i ' + ints)]]