       Re: Problem Replacing part of NonCommutativeMultiply

• To: mathgroup at smc.vnet.net
• Subject: [mg104542] Re: [mg104506] Problem Replacing part of NonCommutativeMultiply
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Tue, 3 Nov 2009 02:56:39 -0500 (EST)

```sub1 = NonCommutativeMultiply[
___ , r, e, r, e, ___] -> 0;

sub2 = ___ ** r ** e ** r ** e ** ___ -> 0;

g ** a ** p ** r ** e ** r ** e /. sub1

0

g ** a ** p ** r ** e ** r ** e /. sub2

0

r ** e ** r ** e /. sub1

0

r ** e ** r ** e /. sub2

0

g ** a ** p ** r ** e ** r ** e ** h /. sub1

0

g ** a ** p ** r ** e ** r ** e ** h /. sub2

0

Bob Hanlon

---- "Iv=C3=A1n Lazaro" <gaminster at gmail.com> wrote:

=============
Dear all,

I'm working with a huge amount (2000) of terms of this tipe:
g**a**p**r**e**r**e

But a lot of them are cero. The problem is that i'm not able to set
r**e**r**e->0 in such expresions. If I do g**a**p**r**e**r**e/.r**e**r**e->0
nothing happens.

Do you have some idea?

Thanks a lot!

```

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