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.
rector (n.) late 14c. (early 13c. in Anglo-Latin), from Latin rector ruler, governor, director, guide, from rect-, past participle stem of regere to rule, guide (from PIE root *reg-move in a straight line, with derivatives meaning to direct in a straight line, thus to lead, rule).