For which $a,b \in\Bbb R$ does there exist the inverse of matrix $A$
2271
Determinant of a rank $1$ update of a scalar matrix, or characteristic polynomial of a rank $1$ matrix
128760
If $A$ and $B$ two $n\times n$ matrix such that $AB=BA$, then $\dim(A\cap B)$?
32108
$ a\in \Bbb Z_n$ is invertible $\,\Rightarrow\gcd (a,n) =1$
138283
$|(a,b)| = |\Bbb R|$ ? Cardinality of any open interval
85550
Positive definiteness of difference of inverse matrices
6398
Can the product of an $4\times 3$ matrix and a $3\times 4$ matrix be invertible?
35834
Is the product of any two invertible diagonalizable matrices diagonalizable?
113518
Determinant of the inverse matrix
112428
Existence of least squares solution to $Ax=b$
4917
Inverse of this $3\times 3$ matrix using the Cayley–Hamilton theorem
124149
Inverse of matrix with nonnegative entries
86841
Find a matrix $B$ such that $B^3 = A$
78298
On the nilpotence of the matrix $AB-BA$
119301
Is the following matrix invertible?
50010
Is this how eigenvalues of some matrix $A$ are related to the inverse of $A$?
77554
Inverse of the sum of matrices
122434
Adjoint of a matrix and inverse of a matrix