Re: Concave Down Decreasing Function

[Virgil]

In article <1146386552.270607.110710@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
 "PFS" <peterschweikert@xxxxxxxxx> wrote:

> Can someone give me an example of a Concave Down Decreasing Function
> over a range of (- infinity, + infinity)? I can't think of one and it
> is driving me nuts.

f(x) = -e^x

Or, generally, the negative of any concave up increasing function.