Find all $n$ by $n$ matrices $A$ such that $A^2 = A.$
126711
What is the square matrix $A$ equal to if $A=A^2$
95103
A rational matrix such that $A^{2017}=I_n$
55787
Is there any matrix $2\times 2$ such that $A\neq I$ but $ A^3=I$?
123726
$2\times 2 $ matrices over $\mathbb{C}$ that satisfy $\mathrm A^3=\mathrm A$
128760
If $A$ and $B$ two $n\times n$ matrix such that $AB=BA$, then $\dim(A\cap B)$?
34536
Columns of matrix $A_{m \times n}$ span $\mathbb{R}^{m}$
156565
Find a matrix that simultaneously diagonalizes to matrices
21758
Rank of the $n \times n$ matrix with ones on the main diagonal and $a$ off the main diagonal
110086
Let $A$ be an $m \times n$ matrix. Show $A^TA$ and $AA^T$ have the same eigenvalues
63260
Matrices whose Linear Combinations are All Singular
48268
How many $\alpha \in S_n$ are such that $\alpha^2 = 1$?
34372
Are $10\times 10$ matrices spanned by powers of a single matrix?
5616
How can I prove the IFF condition for this group of matrices?
118283
Show that if $A^{n}=I$ then $A$ is diagonalizable.
61538
Given a square matrix $A$, both $AA^T$ and $A^TA$ are symmetric
109167
Nth roots of square matrices
129583
Find 3x3 real matrix A such that $A^2 \neq I$ and $A^4 = I$, where I is identity matrix.