Assume $p$ and $q$ are n-variate degree d polynomials. Define $ |p|_{\infty}= \max_{x \in R^n}|p(x)|$ $D(p)=\{ x \in R^n : p(x)= |p|_{\infty} \}$
$E(p)=\{x \in R^n : p(x)= -|p|_{\infty} \}$

Define $D(q)$ and $E(q)$ similarly. Now assume $ D(p) \cup E(p) = D(q) \cup E(q) $ What kind of relation we can deduce between $p$ and $q$ by this assumption?