What is Aut $Z \oplus Z$?
98507
$\text{Aut}(F)$ is isomorphic to the multiplicative group of all $n\times n$ matrices over $\mathbb Z$
18182
An abelian group $G$ with ${\rm Aut}(G)$ non-abelian
128711
$(\Bbb Z\oplus \Bbb Z)[X] \not\cong \Bbb Z[X]\oplus \Bbb Z[X]\,$?
48492
KL divergence of q(z|x) || p(z|x)
95379
Prove that $V = V_1 \oplus V_2$ in the following
46265
Minimal polynomial of the operator $T:V\oplus W\to V\oplus W$
37041
Why is $\text{Aut}(F)$ of the forgetful functor $F$ on $G$-sets isomorphic to $G$?
142631
Show that A has the same cardinality as $A\setminus\{x,y,z\}$
35034
Multiplicative inverses for $Z_n$
36142
What is $\mathbb Z \oplus \mathbb Z / \langle (2,2) \rangle$ isomorphic to?
75504
Theorem 11.14, Apostol, pg 238 - need explanation
40094
Does $G\oplus G \cong H\oplus H$ imply $G\cong H$ in general?
155884
What are the conditions on $\text{tr}(AB) \leq \text{tr(A)} \text{tr(B)}$ to be true?
105363
$\mathbb Z^n/\langle (a,...,a) \rangle \cong \mathbb Z^{n-1} \oplus \mathbb Z/\langle a \rangle$
89192
$(\mathbb R, \oplus)$ is a group. Define a multiplication with which we get a field. Where $a \oplus b = a + b +1$
44259
Heine-Borel Theorem ($\mathbb{R}^k$) (in ZF)
63465
Orthogonal Projection of $ z $ onto the Affine set $ \left\{ x \mid A x = b \right\} $