The term regular can mean normal or in accordance with rules. It may refer to:

People

* Moses Regular (born 1971), America football player

Arts, entertainment, and media

Music

* Regular (Badfinger song), "Regular" (Badfinger song) * Regular tunings of stringed instruments, tunings with equal intervals between the paired notes of successive open strings

Other uses in arts, entertainment, and media

* Regular character, a main character who appears more frequently and/or prominently than a recurring character * Regular division of the plane, a series of drawings by the Dutch artist M. C. Escher which began in 1936 * ''Regular Show'', an animated television sitcom * ''The Regular Guys'', a radio morning show

Language

* Regular inflection, the formation of derived forms such as plurals in ways that are typical for the language ** Regular verb * Regular script, the newest of the Chinese script styles

Mathematics

There are an extremely large number of unrelated notions of "regularity" in mathematics.

Algebra and number theory

(See also the geometry section for notions related to algebraic geometry.) * Regular category, a kind of category that has similarities to both Abelian categories and to the category of sets * Regular chains in computer algebra * Regular element (disambiguation), certain kinds of elements of an algebraic structure * Regular extension of fields * Regular ideal (multiple definitions) * Regular monomorphisms and regular epimorphisms, monomorphisms (resp. epimorphisms) which equalize (resp. coequalize) some parallel pair of morphisms * Regular numbers, numbers which evenly divide a power of 60 * Regular p-group, a concept capturing some of the more important properties of abelian ''p''-groups, but general enough to include most "small" ''p''-groups * Regular prime, a prime number ''p'' > 2 that does not divide the class number of the ''p''-th cyclotomic field * The regular representation of a group G, the linear representation afforded by the group action of G on itself * Regular ring, a ring such that all its localizations have Krull dimension equal to the minimal number of generators of the maximal ideal ** von Neumann regular ring, or absolutely flat ring (unrelated to the previous sense) * Regular semi-algebraic systems in computer algebra * Regular semigroup, related to the previous sense * Semigroup with involution#.2A .E2.80.93 regular semigroups, *-regular semigroup

Analysis

* Borel regular measure * Cauchy-regular function (or Cauchy-continuous function,) a continuous function between metric spaces which preserves Cauchy sequences * Regular functions, functions that are analytic and single-valued (unique) in a given region * Regular matrix (disambiguation) * Regular measure, a measure for which every measurable set is "approximately open" and "approximately closed" * The regular part, of a Laurent series, the series of terms with positive powers * Regular singular points, in theory of ordinary differential equations where the growth of solutions is bounded by an algebraic function * Regularity, the differentiability class, degree of differentiability of a function * Regularity conditions arise in the study of first class constraints in Hamiltonian mechanics * elliptic operator#Elliptic regularity theorem, Regularity of an elliptic operator

Combinatorics, discrete math, and mathematical computer science

* Regular algebra, or Kleene algebra * Regular code, an algebraic code with a uniform distribution of distances between codewords * Regular expression, a type of pattern describing a set of strings in computer science * Regular graph, a graph such that all the degrees of the vertices are equal ** Szemerédi regularity lemma, some random behaviors in large graphs * Regular language, a formal language recognizable by a finite state automaton (related to the regular expression) * Regular map (graph theory), a symmetric tessellation of a closed surface * Regular matroid, a matroid which can be represented over any field * Regular paperfolding sequence, also known as the dragon curve sequence * Regular tree grammar * Regular string, a binary string in which the one-density in any long consecutive substring is close to the one-density in the whole string

Geometry

* Castelnuovo–Mumford regularity of a coherent sheaf * Closed regular sets in solid modeling * Irregularity of a surface in algebraic geometry * Regular curves * Regular grid, a tesselation of Euclidean space by congruent bricks * Regular map (algebraic geometry), a map between varieties given by polynomials * Regular point, a singular point of an algebraic variety, non-singular point of an algebraic variety * Regular point of a differentiable map, a point at which a map is a submersion * Regular polygons, polygons with all sides and angles equal ** Regular polyhedron, a generalization of a regular polygon to higher dimensions **Regular polytope, a generalization of a regular polygon to higher dimensions * Regular skew polyhedron

Logic, set theory, and foundations

* Axiom of Regularity, also called the Axiom of Foundation, an axiom of set theory asserting the non-existence of certain infinite chains of sets * Partition regularity * Regular cardinal, a cardinal number that is equal to its cofinality * Regular modal logic

Probability and statistics

* Regular conditional probability, a concept that has developed to overcome certain difficulties in formally defining conditional probabilities for continuous probability distributions * Regular stochastic matrix, a stochastic matrix such that all the entries of some power of the matrix are positive

Topology

* Free regular set, a subset of a topological space that is acted upon disjointly under a given group action * Regular homotopy * Regular isotopy in knot theory, the equivalence relation of link diagrams that is generated by using the 2nd and 3rd Reidemeister moves only * Regular space (or

T_3

) space, a topological space in which a point and a closed set can be separated by neighborhoods

Organizations

* Regular army for military usage * Regular Baptists, an 18th-century American and Canadian Baptist group * Regular clergy, members of a religious order subject to a rule of life * Regular Force for usage in the Canadian Forces * Regular Masonic jurisdictions, or ''regularity'', refers to the constitutional mechanism by which Freemasonry Grand Lodges or Grand Orients give one another mutual recognition

Science and social science

* Regular bowel movements, the opposite of constipation * Regular economy, an economy characterized by an excess demand function whose slope at any equilibrium price vector is non-zero * Regular moon, a natural satellite that has low eccentricity and a relatively close and prograde orbit * Regular solutions in chemistry, solutions that diverge from the behavior of an ideal solution only moderately

Other uses

* Regular customer, a person who visits the same restaurant, pub, store, or transit provider frequently * Regular (footedness) in boardsports, a stance in which the left foot leads

References

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