收集Hatcher代数拓扑答案

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列出部分问题答案的链接。数字 a.b.c 表示第 a 章 b 节第 c 个问题。
1.2.2 : general topology – Exercise 2 in Hatcher, section 1.2: the union of convex sets is simply connected – Mathematics Stack Exchange
1.2.3 : algebraic topology – Hatcher problem 1.2.3 – technicality in proof of simply connectedness – Mathematics Stack Exchange
1.2.4 : algebraic topology – Fundamental group of complement of $n$ lines through the origin in $\mathbb{R}^3$ – Mathematics Stack Exchange
algebraic topology – Regarding an exercise of Hatcher (fundamental group of $\mathbb{R}^3$ with $n$ lines removed) – Mathematics Stack Exchange
1.2.5 : https://math.stackexchange.com/a/184015/
1.2.6: algebraic topology – Why is the complement of a discrete subspace of $\mathbb{R}^n$ ($n \ge 3$) simply-connected? – Mathematics Stack Exchange
1.2.7 : algebraic topology – compute $\pi_{1}(X)$ with cell complex structure. – Mathematics Stack Exchange
1.2.8 : algebraic topology – Hatcher Exercise 1.2.8 via the van Kampen theorem – Mathematics Stack Exchange
1.2.17 : algebraic topology – $\pi_{1}({\mathbb R}^{2} – {\mathbb Q}^{2})$ is uncountable – Mathematics Stack Exchange
2.2.36 : algebraic topology – Hatcher Problem 2.2.36 – Mathematics Stack Exchange



还有许多其他章节的问题需要收集
欢迎补充！
guanyulee.github.io/Hatcher.pdf
math.umb.edu/~oleg/hw_5_solutions.pdf