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smart change of variables?
Dear all, I have a arithmetic problem. I have an expression expr = (p1 + 2*p2)*(k1 + 2*k2) where p1 + p2 = k1 + k2 I wanna make the following change of variables, s = (p1 + p2)^2 t = (p1 - k1)^2 u = (p1 - k2)^2 Is it possible to tell Mathematica to express expr in terms of s, t, and u automatically? Thanks so much. any ideas would be appreciated. Sincerely Barrow