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Proof step 9 from proof even-mult (previous step)

((2 * i1 + 1) * (2 * i0 + 1)) % 2 = 0 ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: inst: name: even-not-ex seq: ⊦ i % 2 ≠ 0 ↔ (∃ i0. i = 2 * i0 + 1) subst: [i] → [(2 * i1 + 1) * (2 * i0 + 1)] flags: rewrite, current

Additional information

Used terms: (2 * i1 + 1) * (2 * i0 + 1)