单词	Poincaré-Hopf index theorem
释义
随便看	regular economy regular element regular element regular elliptic problem regular embedding regular expression regular expression regular extension regular factor regular fibre regular frustum of a cone regular function regular function regular fuzzy matrix regular generalized function regular graded ring regular grammar regular grammar regular graph regular group regular Hadamard matrix regular hexahedron regular hyperbolic type regular icosahedron regular imbedding

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