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Proof step 8 from proof countrefs-not-zero-01 (previous step)

countrefs(i ' + ints0) = 0 ⊦ countrefs(ints0) = 0, ints0 = []

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ # ints > 1 ∧ ints .first ≤ 0 → countrefs(ints) = 1
Proof step 7:
¬ (# (i ' + ints0) > 1 ∧ (i ' + ints0) .first ≤ 0), countrefs(i ' + ints0) = 0 ⊦ countrefs(ints0) = 0, ints0 = []

Rule argument

[crewrite-arg: countrefs-zero-01, F, [ints] → [i ' + ints0]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (i ' + ints0)]]