Find a $4\times 3$ matrix to make a $3 \times 4$ matrix invertible
6398
Can the product of an $4\times 3$ matrix and a $3\times 4$ matrix be invertible?
148946
If $\mathbf{A}$ is a $2\times 2$ matrix that satisfies $\mathbf{A}^2 - 4\mathbf{A} - 7\mathbf{I} = \mathbf{0}$, then $\mathbf{A}$ is invertible
129583
Find 3x3 real matrix A such that $A^2 \neq I$ and $A^4 = I$, where I is identity matrix.
56555
Create a block matrix with four quadrants
64644
An $r\times r$ submatrix of independent rows and independent columns is invertible (Michael Artin's book).
144145
Symmetric $3\times 3$ Matrices - Base matrix
126990
Invertible matrix and inverse matrix
119301
Is the following matrix invertible?
33559
Product or sum of invertible matrix give an invertible matrix?
37249
Suppose $A$ is a 4x4 matrix such that $\det(A)=\frac{1}{64}$
70723
Why are nonsquare matrices not invertible?
4517
Showing a $2\times2$ matrix is invertible
87136
All matrices which commute with all $2\times 2$ matrices
149292
Inverse of a diagonal matrix plus a constant
124734
If $A^3=O$ is the matrice $A^2-A+I$ invertible?
74341
Proving an invertible matrix which is its own inverse has determinant $1$ or $-1$
65305
Minimal polynomial for an invertible matrix and its determinant