What is the fundamental group of a torus $T^2$ minus finite points?
64021
Fundamental group of a torus with points removed
95779
Torus and Elliptic curves
149029
3-manifold examples of homomorphisms between fundamental groups that are not induced by continuous maps
92033
Prove that $g$ is a submanifold: $g (t,u,v) = (t^2,u^2,v^2,\sqrt{2}uv, \sqrt{2}tv,\sqrt{2}tu)$
154990
Fundamental group of two tori with a circle ($S^1✕${$x_0$}) identified
13631
Showing group with $p^2$ elements is Abelian
11393
The center of the dihedral group
131890
Totally disconnected space that is not $T_2$
148369
Quotient groups of D10
138383
group of units in a topological ring
34177
Prove that $\mathbb{R}^2\setminus\mathbb{Q}^2$ is connected without path connectedness
147148
why is $S^2$ not a Lie group?
137931
Problem from "The Theory of Finite Groups" by Kurzweil and Stellmacher
99689
Zeroth homotopy group: what exactly is it?
67471
Extending to a disc means fundamental group is trivial
58135
Quotient group $SL(2,\mathbb{R})/SO(2,\mathbb{R})$
85222
Direct sum of finitely-many non-abelian groups