The boundary of a convex set is always a convex curve. The intersection of all convex sets containing a given subset A of Euclidean space is called the convex hull of A. It is the smallest convex set containing A.
Rector (ecclesiastical) A rector is, in an ecclesiastical sense, a cleric who functions as an administrative leader in some Christian denominations, and in Islam. In contrast, a vicar is also a cleric but functions as an assistant and representative of an administrative leader.
doctor - a person who holds Ph.D. degree (or the equivalent) from an academic institution; she is a doctor of philosophy in physics Dr. bookman, scholar, scholarly person, student - a learned person (especially in the humanities); someone who by long study has gained mastery in one or more disciplines