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.
Crepuscular rays in Brazil. Crepuscular rays /kráµ»ËpÊskjáµ¿lÉr/ (also known as sunbeams, Sun rays or God rays), in atmospheric optics, are rays of sunlight that appear to radiate from the point in the sky where the sun is located.