Contents

# Contents

## Idea

A square matrix is an $n \times m$-matrix for $n = m$.

Under matrix multiplication the $n \times n$ square matrices for fixed $n \in \mathbb{N}$ with values in some commutative ring $R$ form the matrix algebra $Mat_n(R)$, inside which one finds matrix groups etc.

## Properties

### Gershgorin circle theorem

See at Gershgorin circle theorem.

Last revised on April 21, 2021 at 06:42:00. See the history of this page for a list of all contributions to it.