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Cyclic generator of a cyclic expression


Dear friends,

Given a cyclic expression say in x,y,z like

x^4 + y^4 + z^4 - y^2 z^2 - z^2 x^2 - x^2 y^2

what is your more or less elegant way to get a cyclic generator, like

x^4 - y^2 z^2 ?

Thank you very much.

--
---
Francisco Javier Garc=EDa Capit=E1n
http://garciacapitan.99on.com




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