Re: quadratic multiplication
- To: mathgroup at smc.vnet.net
- Subject: [mg84274] Re: quadratic multiplication
- From: dh <dh at metrohm.ch>
- Date: Mon, 17 Dec 2007 03:04:06 -0500 (EST)
- References: <fk2v35$n96$1@smc.vnet.net>
Hi,
we may create a rule that sets all products of u^s to zero:
mem[y_]:=MemberQ[{u1,u2,u3,u4,u5,u6},y];
rules={y1_ y2_/;mem[y1]&&mem[y2]->0,y_^_/;mem[y]->0};
here is an example:
c1 u1+c2 u2+ c15 u1 u5 + c146 u1 u4 u6 /. rules
hope this helps, Daniel
KFUPM wrote:
> Dear all
>
> I have a very large expression which involves the multiplication of
> these variables:
>
> var ={u1,u2,u3,u4,u5,u6} with some other constants. In the expression,
> i want to suppress any quadratic or higher order multiplication of
> these varibles , e.g u1*u5 or u1*u4*u6 should be zero. And since, my
> expression is huge, i want to do this automatically. Any help in this
> regard is highly appreciated.
>
>
> Sincererly yours,
>
> HMQ
>