Italian Lemma del ping-pong Cited by user IndyJr on 24 Dec 2023 In matematica, il lemma del ping-pong è uno dei numerosi lemmi matematici, che trova applicazione in particolare nella teoria dei gruppi.
Chinese 轨形 Cited by user 書畫晝盡 on 11 Dec 2023 拓扑学与几何学中,轨形(orbifold,“有轨的流形”)是对流形的推广. 粗略地说,轨形是局部为欧氏空间的有限群商的拓扑空间.
English Aspherical space Cited by user Turgidson on 03 Sep 2023 In topology, a branch of mathematics, an aspherical space is a topological space with all homotopy groups is the fundamental group of X.
English Aspherical space Cited by user Turgidson on 03 Sep 2023 In topology, a branch of mathematics, an aspherical space is a topological space with all homotopy groups is the fundamental group of X.