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.
Church of England. 1  a person acting as priest of a parish in place of the rector, or as representative of a religious community to which tithes belong. 2  the priest of a parish the tithes of which are impropriated and who receives only the smaller tithes or a salary.