Nielsen在研究曲面间映射的不动点的时候,引进了自由度的概念.自由度在很大程度上反映了流形本身的性质.王诗宬证明了闭曲面自由度......

Let H be a handlebody, J = { J1, …, Jn } a collection of 2-sided pairwise disjoint simple closed curves on H. The 3-ma......

The word theorem states that x can be denoted as a rotation inserting word of A if x is in the normal closure of A in F(......