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.
A pastor (UK: /ËpÉËstÉ/; US: /ËpÃ¦stÉr/) is usually an ordained leader of a Christian congregation. When used as an ecclesiastical styling or title, the term may be abbreviated to Pr (singular) or Ps (plural). A pastor also gives advice and counsel to people from the community or congregation.