Regular
Regular and regularity may refer to: == Arts, entertainment, and media == === Music === "Regular" (Badfinger song) Regular tunings of stringed instruments, tunings with equal intervals between the paired notes of successive open strings === Other uses === 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 == 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 == === Algebra and number theory === 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 Lie group Regular matrix (disambiguation) Regular monomorphisms and regular epimorphisms, monomorphisms (resp. epimorphisms) which equalize (resp.