Does the given matrix have a square root?
31149
Prove that matrix can be square of matrix with real entries
145980
For every matrix $A\in M_{2}( \mathbb{C}) $ there's  $X\in M_{2}( \mathbb{C})$ such that $X^2=A$?
55787
Is there any matrix $2\times 2$ such that $A\neq I$ but $ A^3=I$?
62850
Linear Algebra: If $A^3 = I$, does $A$ have to be $I$?
89375
given value of matrix, getting it's coordinate
111366
Does there exist a symmetric matrix $A$ such that $2^{\sqrt{n}}\le |\operatorname{Tr}(A^n)|\le2020 \ \cdot 2^{\sqrt{n}}$ for all $n$
24809
For all square matrices $A$ and $B$ of the same size, it is true that $(A+B)^2 = A^2 + 2AB + B^2$?
111550
Let $A$ be a square complex matrix of size $n$ then $\langle Ax,x\rangle=0$ for $\forall x \in \Bbb C^n$ $\iff A=0$
29788
Eigenvalues of a matrix whose square equals its transpose
104917
Is $\sqrt1+\sqrt2+\dots+\sqrt n$ ever an integer?
67686
Square root of Positive Definite Matrix
95449
What is the square root of "$i$"?
149219
If $A$ is a non-square matrix with orthonormal columns, what is $A^+$?
7463
Square root of a square
119100
How to find the matrix of a quadratic form?
110051
Is square root a function?
24441
Inverse of a matrix is expressible as a polynomial?