Posted by haifeng on 2017-03-07 10:52:26 last update 2017-03-07 10:52:26 | Answers (1) | 收藏
证明:
\[ \pi_k(S^n,x_0)\cong\begin{cases} 0, & 1\leqslant k < n,\\ \mathbb{Z}, & k=n. \end{cases} \]
