They were unaware at that time that the second cohomology group with coefficients in the nonzero complex numbers is the Schur multiplier, and therefore that Schur had made some of the first steps forty years earlier.
Sila ay nakalimot sa oras na iyon na ang pangalawang cohomology grupo na may coefficients sa nonzero kumplikadong numero ay ang Schur multiplier, at gayon na Schur ay ginawa ng ilan sa mga unang hakbang ng apatnapu't years mas maaga.