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Problem with collect

There is a larger expression

ss^2 (bla+bla+bla ...) + vv^2 (bla+bla+bla...) + ss(bla+bla+bla...)vv  

which is Expanded[]

I want it in the way mentioned above. Therefore I tried

Collect[expr, {ss^2, vv^2, ss vv}]

which did not work.

What is wrong??

Hans Friedrich Steffani

Hans Friedrich Steffani
Institut fuer Elektrische Maschinen und Antriebe, TU Chemnitz-Zwickau
mailto:hans.steffani at

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