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.
In the Catholic Church, a parish priest (also known as a pastor) is a priest appointed by the bishop to represent him to the local parish, which is a collection of neighborhoods in one small region of a county within a given state. A given city may support a number of parishes, depending on the Catholic population.