Show that $C/c \cong (c/(C^{op}))^{op}$.
52642
Show that $\text{C}/c \cong (c/(\text{C}^{\text{op}}))^{\text{op}}$
120010
Show that $\aleph_{\alpha}^{\aleph_{1}} = \aleph_{\alpha}^{\aleph_{0}}\cdot 2^{\aleph_1}$
94383
Prove that $A^TD-C^TB=I$
121156
Prove that: $\gcd[a,b,c]=\frac{abc.\operatorname{lcm}(a,b,c)}{\operatorname{lcm}(a,b)\operatorname{lcm}(a,c)\operatorname{lcm}(b,c)}$
48291
Proof that $\mathrm{ker}(f^*) = \mathrm{im}(f)^{\perp} $
92588
Showing that $(C_0([0,\infty)), \|\cdot\|_\infty)$ is complete.
33196
show that A(T) is a group under operation of composition of functions
49806
Prove that $\frac{R/ \ker \phi}{(\ker \phi + J)/ \ker \phi} \cong \frac{S}{\phi(J)}$
76317
Let $C$ be the commutator subgroup of $G$. Prove that $G/C$ is abelian
33338
Problem on $\operatorname{Hom}(\mathbb Z_6,R^*\oplus C^*)$
92430
Show that the group is cyclic.
20467
Show that $(y_n)\in l^q$
101286
How show that $|a_{n}-1|\le c\lambda ^n,\lambda\in (0,1)$
73402
Showing that $(\mathbb{Z}/p^{a}\mathbb{Z})^*$ is a cyclic group
119793
Proving that $D_{12}\cong S_3 \times C_2$
27629
How to prove that $S^{2n+1}/S^1$ is homeomorphic to $\mathbb CP^n$ under a given identification
140471
Is $ G \cong G/N \times N$?