Fundamental group of $\mathbb{R}^3$ \ finite number of lines passing through origin.
55070
Fundamental group of complement of $n$ lines through the origin in $\mathbb{R}^3$
55064
Homology groups of torus
2575
Showing that $\mathbb{R}$ is connected
130937
Embeddings of finite groups into $\mathrm{GL}_n(\mathbb{Z})$
83115
A set of elements in a reduced unity ring
145220
Homology Groups of $S^n$
11000
Fundamental group of $\mathbb{R}^2 \setminus (\mathbb{Z} \times \{0\})$
13764
Homomorphisms from $\mathbb{Z} \rightarrow S_3$.
108309
An example of a non-abelian group of order $p^3$
94018
Homology groups of $\mathbb{R}^3\setminus \ S^1$ and $\mathbb{R}^3\setminus E^1_+$
154990
Fundamental group of two tori with a circle ($S^1✕${$x_0$}) identified
55652
Fundamental group of the torus
129943
Torsion on $\pi_1(X)$, $X$ connected and open in $\mathbb{R}^n$
130081
Show that $A_n$ is the kernel of a group homomorphism of $S_n \rightarrow \{−1,1\}$.
101712
Let $X$ be obtained by removing finitely many lines from $\mathbb{R}^3$. How do I prove $X$ is connected?
55281
Why is the fundamental group of the plane with two holes non-abelian?
116759
is the group of rational numbers the fundamental group of some space?