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.
及寇贝（PaulKoebe）与克莱恩（FelixKlein，克莱恩瓶就是
名）对于这个二维流形的
何分类，或者说何化，有很大贡献。
何化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.
及寇贝（PaulKoebe）与克莱恩（FelixKlein，克莱恩瓶就是名）对于这个二维流形的何分类，或者说何化，有很大贡献。
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