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.
Definition of rector. 1 : one that directs : leader. 2a : a member of the clergy (as of the Protestant Episcopal Church) in charge of a parishb : an incumbent of a Church of England benefice in full possession of its rightsc : a Roman Catholic priest directing a church with no pastor or one whose pastor has other duties.