Given a finite set of points $P$, we can think of two meanings for the term "convex hull of $P$:"
- The set of convex combinations of points from $P$, $\sum \alpha_i p_i$ s.t. $\sum \alpha_i = 1 \wedge \forall \alpha_i \geq 0$.
- The points $P' \subseteq P$ which are "active" in the convex hull; that is, the removal of which changes the set of points from (1).
Question: Is there a standard way to refer specifically to (1) or (2)?