Relation or relations may refer to:

General uses

International relations International relations (IR), sometimes referred to as international studies and international affairs, is the scientific study of interactions between sovereign states. In a broader sense, it concerns all activities between states—such a ...

, the study of interconnection of politics, economics, and law on a global level *

Interpersonal relationship The concept of interpersonal relationship involves social associations, connections, or affiliations between two or more people. Interpersonal relationships vary in their degree of intimacy or self-disclosure, but also in their duration, in t ...

, association or acquaintance between two or more people *

Public relations Public relations (PR) is the practice of managing and disseminating information from an individual or an organization (such as a business, government agency, or a nonprofit organization) to the public in order to influence their perception. ...

, managing the spread of information to the public *Sexual relations, or

human sexual activity Human sexual activity, human sexual practice or human sexual behaviour is the manner in which humans experience and express their sexuality. People engage in a variety of sexual acts, ranging from activities done alone (e.g., masturbation) t ...

Social relation A social relation or also described as a social interaction or social experience is the fundamental unit of analysis within the social sciences, and describes any voluntary or involuntary interpersonal relationship between two or more individuals ...

, in social science, any social interaction between two or more individuals

Logic and philosophy

* Relation (philosophy), links between properties of an object *

Relational theory Relationalism is any theoretical position that gives importance to the relational nature of things. For relationalism, things exist and function only as relational entities. Relationalism may be contrasted with relationism, which tends to emphasize ...

, framework to understand reality or a physical system

Mathematics

A finitary or ''n''-ary relation is a set of ''n''-tuples. Specific types of relations include: *

Relation (mathematics) In mathematics, a relation on a set may, or may not, hold between two given set members. For example, ''"is less than"'' is a relation on the set of natural numbers; it holds e.g. between 1 and 3 (denoted as 1 is an asymmetric relation, but � ...

* Binary relation (or correspondence, dyadic relation, or 2-place relation) * Equivalence relation *

Homogeneous relation In mathematics, a homogeneous relation (also called endorelation) over a set ''X'' is a binary relation over ''X'' and itself, i.e. it is a subset of the Cartesian product . This is commonly phrased as "a relation on ''X''" or "a (binary) relation ...

Reflexive relation In mathematics, a binary relation ''R'' on a set ''X'' is reflexive if it relates every element of ''X'' to itself. An example of a reflexive relation is the relation " is equal to" on the set of real numbers, since every real number is equal ...

Serial relation In set theory a serial relation is a homogeneous relation expressing the connection of an element of a sequence to the following element. The successor function used by Peano to define natural numbers is the prototype for a serial relation. Bertran ...

Ternary relation In mathematics, a ternary relation or triadic relation is a finitary relation in which the number of places in the relation is three. Ternary relations may also be referred to as 3-adic, 3-ary, 3-dimensional, or 3-place. Just as a binary relat ...

(or triadic, 3-adic, 3-ary, 3-dimensional, or 3-place relation) Relation may also refer to: * Directed relation * Relation algebra, an algebraic structure inspired by algebraic logic

Databases and ontology

* Relational model, an approach to managing data **

Relation (database) In database theory, a relation, as originally defined by E. F. Codd, is a set of tuples (d1, d2, ..., dn), where each element dj is a member of Dj, a data domain. Codd's original definition notwithstanding, and contrary to the usua ...

, a component of a relational database **

Relational algebra In database theory, relational algebra is a theory that uses algebraic structures with a well-founded semantics for modeling data, and defining queries on it. The theory was introduced by Edgar F. Codd. The main application of relational algebr ...

Relational calculus The relational calculus consists of two calculi, the tuple relational calculus and the domain relational calculus, that are part of the relational model for databases and provide a declarative way to specify database queries. The raison d'être ...

** Relational database, a digital database *Relationships (also known as relations), one of the

ontology components Contemporary ontologies share many structural similarities, regardless of the ontology language in which they are expressed. Most ontologies describe individuals (instances), classes (concepts), attributes, and relations. Overview Common com ...

Art and literature

*''

Relation aller Fürnemmen und gedenckwürdigen Historien Johann Carolus (26 March 1575 − 15 August 1634) was a German publisher of the first newspaper, called ''Relation aller Fürnemmen und gedenckwürdigen Historien'' (Account of all distinguished and commemorable stories). The ''Relation'' is re ...

'', the first newspaper * ''Relation'' (1982 film), a 1982 Japanese short experimental film * ''Relations'' (album), a 2004 album of cover versions by Kathryn Williams

General uses

Logic and philosophy

Mathematics

Databases and ontology

Art and literature

See also