# 5.1: Introduction

Skills to Develop

- To introduce a third approach to removing redundancy in an algorithm to express the algorithm as an operator and then factor that operator into sparse factors

A third approach to removing redundancy in an algorithm is to express the algorithm as an operator and then factor that operator into sparse factors. This approach is used by Tolimieri, Egner, Selesnick, Elliott and others. It is presented in a more general form in DFT and FFT: An Algebraic View The operators may be in the form of a matrix or a tensor operator.

The following sections briefly describe this approach.

### Contributor

- ContribEEBurrus