$2 \times 2$ matrix $A$ where $\operatorname{Col}A=\operatorname{Nul}A$
41805
Can a matrix have a null space that is equal to its column space?
64517
Prove that row rank of a matrix equals column rank
48961
system of matrix equations
110484
Condition on a matrix so that its determinant is $2$
148668
How to show $A\times (B\cup C) = (A\times B)\cup (A\times C)$
13948
Matrix in a matrix
1865
Sub-determinants of an orthogonal matrix
86841
Find a matrix $B$ such that $B^3 = A$
3330
Square matrices, ABA = A?
34759
Name of a special matrix
139201
Finding Jordan basis of a matrix $(4\times 4)$
1906
Multiplying by a $1\times 1$ matrix?
131212
Prove that if $A$ is regular then $\operatorname{adj}(\operatorname{adj}(A)) = (\det A)^{n-2} A$
70468
Row space and column space of $A^T A$ and $A A^T$
87136
All matrices which commute with all $2\times 2$ matrices
6905
Rank of product of a matrix and its transpose
10083
Determinant of matrix times a constant.