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Question: ignore terms above particular order/power

Question:ignore terms above particular order/power

pl.0 20 Maple
example
June 08 2009
0

hi

I'm dealing with an expression involving terms like:

( a * x ^ l * y ^ m * z ^ n ) + ( b * x ^ p * y ^ q * z ^ r ) + more of the same. The powers can add up to order <=8 [ for example  l + m + n can add up to 8 or less ]

How do I "ignore" terms in my expression where the powers add up to more than 4 ?  [ I know that these orders of magnitude can be ignored ]

I'm trying to use "collect" but can't see how to do this yet.

many thanks

Peter

 
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