Re: Signing with Inequality Constraints
- To: mathgroup at smc.vnet.net
- Subject: [mg22455] Re: [mg22479] Signing with Inequality Constraints
- From: BobHanlon at aol.com
- Date: Wed, 8 Mar 2000 02:21:53 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Using 3.0:
Unprotect[Greater, Less]; Clear[a, b, Greater, Less];
a /: (a > b) = True;
a /: (b < a) = True;
(b-a < 0) = True;
(0 > b-a) = True;
Protect[Greater, Less];
{b-a < 0, 0 > b-a, a > b, b < a}
{True, True, True, True}
Bob Hanlon
In a message dated 3/4/2000 3:46:17 AM, vazzana at kyblue.com writes:
>Using 3.0, I know that I can define
>In:= a :/ Sign[a]=-1
>in order to say a<0. .
>
>Is there an analogous way to tell Mathematica that b-a<0.
>