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.
Vicars have various titles based on what role they are performing. An apostolic vicar is a bishop or priest who heads a missionary particular Church that is not yet ready to be a full diocese-he stands as the local representative of the Pope, in the Pope's role as bishop of all unorganized territories. vicar forane, also known as an archpriest or dean, is a priest entrusted by the bishop with a certain degree of leadership in a territorial division of a diocese or a pastoral region known as a vicarate forane or a deanery.