What is the fundamental group of $RP^{2}$ # $\cdots$ # $RP^{2}$
94215
Fundamental group of the connected sum of manifolds
118898
Is there a simple way of proving that $\text{GL}_n(R) \not\cong \text{GL}_m(R)$?
23037
Computing the order of $\mathrm{SL}_2(\mathbb F_p)$ as the kernel of $\mathrm{GL}_2(\mathbb F_p)$
55652
Fundamental group of the torus
126930
Finding all group homomorphisms of $S_n\to\mathbb{C}^*$ and $A_n\to\mathbb{C}^*$
89382
In a group $G$ where $\exists!$ nontrivial, proper subgroup, show that $G$ is cyclic and $\lvert G\rvert=p^2$, for $p$ prime.
152589
How to show that if $G$ is union of three proper subgroups, then there is an epimorphism from $G$ to the Klein 4-group?
154990
Fundamental group of two tori with a circle ($S^1✕${$x_0$}) identified
67471
Extending to a disc means fundamental group is trivial
113357
Groups of order $pqr$ and their normal subgroups
116759
is the group of rational numbers the fundamental group of some space?
24039
Fundamental Group of Punctured Plane
138297
Let $G = GL_2\mathbb (R)$. Show that $T$ is a subgroup of $G$
64021
Fundamental group of a torus with points removed
38130
Complex structure on $\mathbb{C}\mathbb{P}^2\# \dots \# \mathbb{C}\mathbb{P}^2$
91287
Is $G/pG$ is a $p$-group?
27056
$ gl(2,\mathbb C) \cong sl(2,\mathbb C) \oplus \mathbb C $