Restriction

From Wikipedia, the free encyclopedia

A restriction may refer to:

• In general usage, a restriction is a specific type of rule which defines a finite (and generally absolute) boundary defined for a type of process or function.
• In mathematics, a restriction is a type of function.
• In mathematics, in the context of sheaves and binary relations, a restriction is a type of function.
• In business and economics, a restriction is a type of boundary or regulation placed on the trade of certain goods or services.
• in biology, it corresponds to the restriction of the rule of sensibility of bacteria to phages, and therefore corresponds to the means by which the resistance phenomenon occurs : the restriction enzymes.

The adjectival form, "restricted," may be used in reference to written or unwritten covenants enforcing racial or ethnic segregation or religious segregation — frequently anti-Jewish or more generally anti-Semitic — in housing (see "Restrictive covenant") or in organizations, such as country clubs.