Identity

• In philosophy, identity has both metaphysical and logical senses.
• In mathematics, an identity, as distinguished from an equation, is an equality that always holds regardless of the values of any variables that appear in it. Most commonly identities in this sense are used in universal algebra to define a certain class of structures. In another popular usage, an identity is considered as a mathematical entity that does not change other objects. In this spirit, one talks about identity functions, identity elements, identity matrices, identity relations, and identity morphisms.
• Digital identity is the representation of identity in terms of digital information. A digital identity can be understood as the set of digital information that is attributable to any given entity. This entity may be human (an individual or a community), a physical object, or even digital information itself.
• In object-oriented programming, identity (object-oriented programming) is a property of objects that allows those objects to be distinguished from each other.
• In the social sciences, identity has specific meanings, stemming from cognitive theory, sociology, politics, and psychology. See identity (social science).
• In business and marketing, the corporate identity is the physical manifestation of the brand.
• For security systems, authentication identity includes the characteristics that a person has that can be verified.
• In philosophy of mind the identity theory of mind holds that the mind is identical to the brain.
• In music, identity is used in a similar sense as the universal algebra above.
• For the periodical publication Identity, see Identity (magazine).
• Identity is a movie starring John Cusack.
• Identity is a novel written by Milan Kundera.
• Identity may be short for identity document