Confused by step in calculating fundamental groups of cell complexes using Seifert-Van Kampen theorem
55652
Fundamental group of the torus
24039
Fundamental Group of Punctured Plane
135980
Geometric interpretation of a complex set
23037
Computing the order of $\mathrm{SL}_2(\mathbb F_p)$ as the kernel of $\mathrm{GL}_2(\mathbb F_p)$
61709
Compute factor group $\dfrac{\mathbb{Z}_4 \times \mathbb{Z}_6}{\langle(2,3)\rangle}$ - Fraleigh p. 147 Example 15.11
142698
Proving that the fundamental groups of two spaces with same homotopy type are isomorphic
148369
Quotient groups of D10
124829
Prove homotopic attaching maps give homotopy equivalent spaces by attaching a cell
76040
Show that the Euler characteristic of a chain complex is equal to the Euler characteristic of its homology
132653
How to show that $\mathfrak{sl}_n(\mathbb{R})$ and $\mathfrak{sl}_n(\mathbb{C})$ are simple?
138410
Centralizer of $\mathbb{C}[G]$ in $\mathbb{C}[H]$
137761
Why are the fundamental and anti-fundamental representation in $\text{SL}(2,\mathbb{C})$ not equivalent?
89843
Is the center of the fundamental group of the double torus trivial?
12104
How to prove this result involving the quotient maps and connectedness?
29269
fundamental group of $GL^{+}_n(\mathbb{R})$
68422
Understanding Lagrange's Theorem (Group Theory)
98765
Showing that $G/(H\cap K)\cong (G/H)\times (G/K)$