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Re: collecting certain powers

• To: mathgroup at smc.vnet.net
• Subject: [mg97605] Re: collecting certain powers
• From: Barış Erbaş <erbas.baris at gmail.com>
• Date: Tue, 17 Mar 2009 04:56:13 -0500 (EST)
• References: <e9fca870903160410x2b1c7c02x87c23d4dbab2de99@mail.gmail.com>

Dear Mathematica users,
I have a problem which may be straightforward, but I was unable to
find an answer.

The problem is this: I have an expression which contain many terms with
variables, t, \tau and 1/\lambda. I need to Collect all terms in powers of
1/\lambda, which I did. However, in the result I want the constant term to
disappear, i.e. after applying the command (either Collect, or a more
suitable one) I only want terms in powers of 1/\lambda.
Collect does not give me want I want. Also, is it possible to order the
obtained expression in terms of increasing (or decreasing) powers of the
variable. Mathematica seems to be ordering a little randomly.


Many Thanks,

Baris.