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Proof step 5 from proof bitsor-empty (previous step)

bitsor(bits, bits0) = [] ⊦ bits = [], bits0 = [], # bits ≠ 1 ∧ # bits0 ≠ 1

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 6:
⊦ bits ≠ [] ∧ bits0 = true ' → bitsor(bits, bits0) = true '
Proof step 7:
¬(bits ≠ [] ∧ bits0 = true '), bitsor(bits, bits0) = [] ⊦ bits = [], bits0 = [], # bits ≠ 1 ∧ # bits0 ≠ 1

Rule argument

name: or-rec-01 rotate: F subst: [bits0, bits] → [bits0, bits]

Additional information

Used terms: bits0, bits