## A real matrix has all real entries.

## i (j) is called the row (column) subscript.

## An m_n matrix is said to be of size (or dimension) m_n.

## If m=n the matrix is square of order n.

## The ai,i’s are the diagonal entries.

## Operations on matrices are very useful in real life (go over handout on Digital Images and applications to x-rays and prosecution of Damian Williams).

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