Poincaré (who else?), along with Paul Koebe and Felix Klein (after whom the Klein bottle is named), contributed to this geometric classification, or geometrization, of 2-manifolds.
以及寇贝(PaulKoebe)与克莱恩(FelixKlein,克莱恩以他为名)对于这个二维流形的
何分类,或者说
何化,有很大贡献。