# Notes:Simple function approximation to a numerical function

From Maths

[ilmath]\newcommand{\snaf}{\text{Snaf} } [/ilmath]

## Contents

## Terminology

- [ilmath]\text{Snaf} [/ilmath] -
*simple numerical approximating function*^{[Note 1]}

## Raw notes

The problem is: is a [ilmath]\Snaf[/ilmath] the *non-negative* approximation "lemma" we first start with, or is it the thing build with two of them?

## Notes

- ↑ Originally is was
*approximation*function, this suggests that the [ilmath]s[/ilmath] [ilmath]\rightarrow[/ilmath] a simple function - is a numerical function. However [ilmath]s[/ilmath] is a*simple numerical approximating function*- ie a function that is simple and approximates something numerical. We are approximating*extended real value*functions, that's what we mean by "numerical function"

This note is only here for my sake. To get*approximation*out of my head