??? ?????? ????????? ? ???? ???????? .... ? ??????? ????????? ? ?? ??????? ?????????? ????? - ???? ???'?????? ????????? ??????????, ?? ?????? ???????? ?. Nevertheless, his 1st exploration paper arrived about mainly because he found an mistake in Luther Eisenhart's system on Riemannian Geometry which he attended during his yr as an Teacher. Eisenhar