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Proof step 20 from proof mod-square-10 (previous step)

4 * i0 * i0 = j * 10, 5 | 4 * i0 * i0 ⊦ (2 * i0) % 10 = 0

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: inst: name: prime-divides seq: ⊦ prime(i) → (i | j * j0 ↔ i | j ∨ i | j0) subst: [j0, j, i] → [i0 * i0, 4, 5] flags: rewrite, current

Additional information

Used simplifier rules: prime-5: ⊦ prime(5); Used terms: i0 * i0, 4, 5