Sum of two invertible matrices
33559
Product or sum of invertible matrix give an invertible matrix?
76723
Solving the matrix equation and finding the matrices inverse
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
76160
Dimension of the sum of two vector subspaces
97733
Can it be determined that the sum of the diagonal entries, of matrix A, equals the sum of eigenvalues of A
74341
Proving an invertible matrix which is its own inverse has determinant $1$ or $-1$
108688
An identity involving products of sums
73155
Prove that for any square matrix, an invertible matrix B exists, so that BA is triangular
155479
Summation of inner products
75215
Properties of invertible matrices
140768
Proof of Vandermonde Matrix Inverse Formula
138342
Proof of a matrix exponential identity
43570
Finding two non-zero matrices where $AX = BA$
33955
Geometric series of matrices
4517
Showing a $2\times2$ matrix is invertible
5758
Prove that $I+\lambda A$,$I+\lambda B$,$I+\lambda C$ are invertible and A=B=C
106097
Spectrum of the sum of two commuting matrices