[NumericPrelude] GCD as monoid

[Henning Thielemann]

On Sun, 4 Jul 2010, Paul McJones wrote:

> Would this be like calculating the alignment for a C struct that contains 
> various members with individual alignment requirements, in which case 
> wouldn't LCM be used, e.g. alignment for a 2-byte object and an 8-byte object 
> would be 8 bytes?

Sorry, yes, the alignment is computed with LCM, not GCD.