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series expansions in two variables problem


hi, 
I'm expanding an expression in two variables (sigma and epsilon, say),
but am having trouble persuading Mathematica to chuck away terms of
form epsilon*sigma.

ie I'm getting

A + B*sigma + C*epsilon + D*sigma*epsilon + O(sigma^2) + O(epsilon^2)

and I'd like very much to lose the D terms.

does anyone have any suggestions?  

Thanks

Martin


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