Re: multiple.....

From: Bill Dubuque (wgd_at_nestle.csail.mit.edu)
Date: 12/30/04 

Date: 30 Dec 2004 12:42:01 -0500

Bill Dubuque wrote:
>mina_world <mina_world@hanmail.net> wrote: (*edited*)
>>
>> SHOW u|ac,bd,ad+bc => u|ad,bc, u,a,b,c,d in Z
>
> HINT (x-ad/u)(x-bc/u)

HINT 2 Two rationals r, s are both integers

        if & only if r+s, rs are both integers

--Bill Dubuque