Number of $(0,1)$ $m \times n$ matrices with exactly $k$ ones and no row or column contains only zeros
52564
$m\times n$ matrix with an even number of 1s in each row and column
52882
find nonsingular matrices $B$ and $C$ that satisfy $BC+ CB= 0$
60231
Number of equivalence classes of matrices under switching rows and columns
65158
Oddity: Determinant of Skew-Symmetric $n\times n$ Matrices
41411
How to show that the nth power of a $n \times n$ nilpotent matrix equals to zero $A^n=0$
109167
Nth roots of square matrices
18297
Suppose that each of the row sums of an $n\times n$ matrix $A$ is equal to zero. Show that $A$ must be singular.
12955
Classification of $n\times n$ real matrices up to congruence
27865
What is the number of invertible $n\times n$ matrices in $\operatorname{GL}_n(F)$?
47799
Show that the number or $r$ combinations of $X$ which contain no consecutive integers is given by $\binom{n-r+1}{r}$
41813
How to prove positive (semi-)definitness in matrix notation without numbers
66784
Number of strings lenght $n$ with no consecutive zeros
63007
Number of self-inverse matrices over prime field
97908
Finding the no. of possible matrices given the order and limited no. of entries
73697
Let $A, B$ be $n\times n$ with $n\ge 2$ nonsingular matrices with real entries such that $A^{-1} + B^{-1} =(A+B)^{-1}$
111339
Why the determinant of even-sized magic matrices are zero? Anything special?
66842
Number of $n^2\times n^2$ permutation matrices with a 1 in each $n\times n$ subgrid