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Re: Shortening Polynomials


>  Dear Mathgroupers,
>  

>  Many thanks for all the replies I got for my previous
>  requests.  I have a feeling this may be trivial, but I
>  often want to shorten polynomials, after using Expand.
>  At the moment, I use the following type of unwieldy
>  expression:
>  

>  t1 = a0 + a1 q + a2 q^2 ; 

>  Expand[%^4] /.
>  {q^3->0,q^4->0,q^5->0,q^6->0,q^7->0,q^8->0};
>  

>  Is there a neater way to collect powers up to order m
>  after expanding a polynomial?
>  

>  Thanks, Stephen

Take[Expand[t1^4],3] is what you want.

Richard Mercer


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