A commutes with everything that commutes with B
25357
Matrices $B$ that commute with every matrix commuting with $A$
151676
Being characteristic is transitive
41044
Equivalence of $a \rightarrow b$ and $\lnot a \vee b$
109710
Bijection between $\mathbb N \times \mathbb N$ and $\mathbb N$
123890
Show $A\setminus (A\cap B)=(A\cup B)\setminus B$
22856
Ways to go from A to B(proof)
125345
Suppose $a$ and $b$ are group elements, $a$ and $b$ commute, $|a|$ and $|b|$ are both finite. What are the possibilities for $|ab|$?
57269
A special bijection between $\mathbb{R}\times \mathbb{R}$ and $\mathbb{R}$
148569
Embeddings $A → B → A$, but $A \not\cong B$?
6096
If $A+B=AB$ then $AB=BA$
24126
When functions commute under composition
145719
Similarity between $A$ and $B (2\times 2)$.
37061
The order of $ab$ when $a,b$ commute
48607
If $A$ is normal and $A$ and $B$ commute, then $A^*$ and $B$ commute
155545
Showing that $a \mid b$ and $b \mid a$ if and only if $a= \pm b$.
23464
How to find a explicit bijection for some $f:A\times B \rightarrow B \times A$
73334
Proving this relation is transitive