Definition 16.2.2 (Absolute Polar).label Let $\dpn{E, F}{\lambda}$ be a duality over $K \in \RC$ and $A \subset E$, then
\[A^{\square} = \bracsn{y \in F|\ |\dpn{x, y}{\lambda}| \le 1 \forall x \in A}\]
is the absolute polar of $A$.
Definition 16.2.2 (Absolute Polar).label Let $\dpn{E, F}{\lambda}$ be a duality over $K \in \RC$ and $A \subset E$, then
is the absolute polar of $A$.