[FOM] Is logic prescriptive or descriptive?

[Cristian Cocos]

On 7/9/2012 12:22, ARF (Richard L. Epstein) wrote:
> A crucial question for the foundations of mathematics and logic generally is:
>
>       Is logic prescriptive or descriptive?
>

I do not see a contradiction in claiming both (descriptive of something, 
but prescriptive of(?) something else).

C