Are $_{\Bbb Q}\Bbb Q$ and $_{\Bbb R}\Bbb R$ artinian left modules?
61962
Show $R$ is right-Artinian but not left-Artinian
18343
Counting homomorphisms between $\Bbb Z$ and $\Bbb Z_n$ and also between $\Bbb Z_n$ and $\Bbb Q$
125894
Prove that $\mathbb{Q}$ belongs to the Borel $\sigma$-algebra of $\mathbb{R}$
128966
Explicit bijection between $\Bbb R$ and permutations of $\Bbb N$
130381
bijection from $(a,b)$ to $\Bbb R$
76100
Showing that $\left\langle a,b \mid abab^{-1}\right\rangle \cong \pi_1(K) \cong \left\langle c,d \mid c^2 d^2 \right\rangle$
83812
Artinian ring and faithful module of finite length
58028
Semisimplicity is equivalent to each simple left module is projective?
87750
Hom / tensor adjunction for $O_X$ modules?
157236
Tensor product of modules.
8417
Natural $(R/I)$-module structure for an $R$-module $M$ annihilated by $I$
124230
What is $\operatorname{Hom}_\mathbb{Z}(\mathbb{Q}/\mathbb{Z},\mathbb{Q}/\mathbb{Z})$?
137029
Prove that $\operatorname{Hom}_{\Bbb{Z}}(\Bbb{Q},\Bbb{Z}) = 0$ and show that $\Bbb{Q}$ is not a projective $\Bbb{Z}$-module.
26110
Canonical isomorphism between $\mathfrak{so}(3)$ and $\mathbb R^3$ with vector cross product
40705
If $M$ is an $R$-module and $I\subseteq\mathrm{Ann}(M)$ an ideal, then $M$ has a structure of $R/I$-module
128711
$(\Bbb Z\oplus \Bbb Z)[X] \not\cong \Bbb Z[X]\oplus \Bbb Z[X]\,$?
136804
Computing $\mathrm{Hom}(\mathbb Z_n,\mathbb Z_m)$ as $\mathbb Z$-module