In this same year, 1922, Nikolai was to prove the theorem for which he is best known, the density theorem, which had been conjectured by Frobenius in a paper written in 1880 but only published in 1896.
Sa parehong taon na ito, 1922, Nikolai ay upang patunayan ang teorama na kung saan ay siya ang pinakamahusay na kilala, ang densidad teorama, na kung saan had been conjectured sa pamamagitan ng Frobenius sa isang papel na nakasulat sa 1880 ngunit lamang na nai-publish sa 1896.