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Proof step 3 from proof max_prime_divisor-divides (
previous step
)
⊦ ¬ prime(i) ∧ 2 ≤ i → (∃ j. prime(j) ∧ j | i ∧ j < i ∧ (∀ j0. j < j0 ∧ j0 < i ∧ prime(j0) → ¬ j0 | i))
Lemma
prime-ex-max