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Jun 16, 2019 at 14:44 comment added Federico Poloni @user44191 Good point. And also evaluating the derivative works.
Jun 16, 2019 at 14:00 comment added user44191 I think any substitution works: for any polynomial $R$, $F_R(P) = P \circ R, H = ux$.
Jun 16, 2019 at 12:11 history answered Federico Poloni CC BY-SA 4.0