erdos_494.variant.k_eq_2_card_not_pow_two

Selfridge and Straus [SeSt58] showed that the conjecture is true when $k = 2$ and $|A| \ne 2^l$ for $l \ge 0$. They also gave counterexamples when $k = 2$ and $|A| = 2^l$.

theorem erdos_494.variant.k_eq_2_card_not_pow_two :
    ∀ card : ℕ, (∀ l : ℕ, card ≠ 2 ^ l) → Erdos494Unique 2 card

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