Inverse of a matrix — when is it defined?
3301
If $AB = I$ then $BA = I$
97781
invertible matrices connected or not
37182
If an element has a unique right inverse, is it invertible?
119301
Is the following matrix invertible?
85845
Matrix with zeros on diagonal and ones in other places is invertible
98317
What is the geometric relationship between the covariance matrix and the inverse of the covariance matrix?
59125
Why does this matrix give the derivative of a function?
149086
Determining $\mbox{tr}(A)$ and $\det(A)$ as functions of the eigenvalues of a matrix
52040
"Inverse" of an $n\times k$ matrix.
42467
Inverse of an invertible triangular matrix (either upper or lower) is triangular of the same kind
150387
Questions about matrix rank, trace, and invertibility
140768
Proof of Vandermonde Matrix Inverse Formula
46623
How to evaluate the derivatives of matrix inverse?
33355
Proving that matrix in equation is invertible
116136
Proof that the inverse of a square matrix is unique
155272
Is a matrix with $1$s in the diagonal and off-diagonal entries with absolute value less than $1$ invertible?
29155
Definition of orthogonal matrix