completely regular
21Topological property — In topology and related areas of mathematics a topological property or topological invariant is a property of a topological space which is invariant under homeomorphisms. That is, a property of spaces is a topological property if whenever a space …
22Special classes of semigroups — In mathematics, a semigroup is a nonempty set together with an associative binary operation. A special class of semigroups is a class of semigroups satisfying additional properties or conditions. Thus the class of commutative semigroups consists… …
23linguistics — /ling gwis tiks/, n. (used with a sing. v.) the science of language, including phonetics, phonology, morphology, syntax, semantics, pragmatics, and historical linguistics. [1850 55; see LINGUISTIC, ICS] * * * Study of the nature and structure of… …
24Uniformizable space — In mathematics, a topological space X is uniformizable if there exists a uniform structure on X which induces the topology of X . Equivalently, X is uniformizable if and only if it is homeomorphic to a uniform space (equipped with the topology… …
25Inverse element — In abstract algebra, the idea of an inverse element generalises the concept of a negation, in relation to addition, and a reciprocal, in relation to multiplication. The intuition is of an element that can undo the effect of combination with… …
26Tychonoff's theorem — For other theorems named after Tychonoff, see Tychonoff s theorem (disambiguation). In mathematics, Tychonoff s theorem states that the product of any collection of compact topological spaces is compact. The theorem is named after Andrey… …
27Uniform space — In the mathematical field of topology, a uniform space is a set with a uniform structure. Uniform spaces are topological spaces with additional structure which is used to define uniform properties such as completeness, uniform continuity and… …
28French conjugation — This article is part of the series on: French language Langues d oïl Dialects Creoles Francophonie History Oaths of Strasbourg Ordinance of Villers Cotterêts Anglo Norman Grammar …
29Ancient Greek grammar — is morphologically complex and preserves several features of Proto Indo European morphology. Nouns, adjectives, pronouns, articles, numerals and especially verbs are all highly inflected. This article is an introduction to this morphological… …
30Topological indistinguishability — In topology, two points of a topological space X are topologically indistinguishable if they have exactly the same neighborhoods. That is, if x and y are points in X, and A is the set of all neighborhoods which contain x, and B is the set of all… …
