The inverse of the matrix $\{1/(i+j-1)\}$
25159
Why does the inverse of the Hilbert matrix have integer entries?
81240
Norm of an inverse operator: $\|T^{-1}\|=\|T\|^{-1}$?
64742
Prove a residue matrix $A$ (with coefficients in $\mathbb Z_n)$ has an inverse if and only if $\gcd(\det A,n) = 1$
8970
Proving the cross product matrix tranformation identity with an alternative solution
259
Proving the determinant of a tridiagonal matrix with $-1, 2, -1$ on diagonal.
85845
Matrix with zeros on diagonal and ones in other places is invertible
42467
Inverse of an invertible triangular matrix (either upper or lower) is triangular of the same kind
148888
How does the inverse transform method work?
65305
Minimal polynomial for an invertible matrix and its determinant
126990
Invertible matrix and inverse matrix
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
122434
Adjoint of a matrix and inverse of a matrix
42809
How can we show that $(I-A)$ is invertible?
141015
Proof of orthogonal matrix
155272
Is a matrix with $1$s in the diagonal and off-diagonal entries with absolute value less than $1$ invertible?
137109
Evaluating a summation of inverse squares over odd indices
39909
Getting a closed form from $\sum_{i=1}^{n-1} \sum_{j=i+1}^{n} \sum_{k=1}^{j} 1$