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.
A chancellor is a leader of a college or university, usually either the executive or ceremonial head of the university or of a university campus. In most Commonwealth and former Commonwealth nations, the chancellor is usually a ceremonial non-resident head of the university.