# If someone says something about a fourth-order approximation, does that mean ?

1. Jun 29, 2009

### AxiomOfChoice

If someone says something about a "fourth-order approximation," does that mean...?

...that, say, if something is being approximated by a Taylor series expansion in which only the first few terms are retained, and the expansion is in a small parameter $\kappa$, we only keep the terms up to order $\kappa^4$?

2. Jun 29, 2009

### Monocles

Re: If someone says something about a "fourth-order approximation," does that mean...

You got it.