However, as noted in (Parshall 1983), Wedderburn's first proof was incorrect – it had a gap – and his subsequent proofs appeared only after he had read Dickson's correct proof.
しかしながら、(Parshall 1983) に述べられているように、Wedderburn の最初の証明は正しくなく――飛躍があり――彼の次の証明は Dickson の正しい証明を読んだ後に現れたのだった。