Outline
- is a matrix with rows and columns.
- Matrices are equal if each of their corresponding entries are equal.
- If , we have a square matrix.
- Addition of matrices: just like vectors, corresponding entries are summed up.
- Scalar multiplication of matrices: like vectors, each entry is multiplied with the scalar multiple.
- Transpose of is . Rows become columns, and cols become rows.
- Symmetric matrices. If . (not vice versa)