# Tags

A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

 Type to find tags:
 error-function× 131 for the error and complementary error functions (erf and erfc). These are special functions formed by taking definite integrals of the Gaussian/normal distribution function. geometric-probability× 131 Probabilities of random geometric objects having certain properties (enclosing the origin, having an acute angle,...); expected counts, areas, ... of random geometric objects. For questions about the … operations-research× 128 is a discipline to apply analytical methods for better decisions. It has many synonyms such as management science, decision science and system science. infinitesimals× 128 For questions about infinitesimals, both in an intuitive sense as well as more rigorous settings (see also [nonstandard-analysis]). separation-axioms× 128 properties of topological space which, roughly speaking, say in what way two points, a point and a closed set, or two closed sets can be "separated". pythagorean-triples× 127 Questions about Pythagorean triples, positive integer solutions to $a^2 + b^2 = c^2$. network× 127 multinomial-coefficients× 125 For questions related to multinomial coefficients, a generalization of binomial coefficients. monoidal-categories× 125 In mathematics, a monoidal category (or tensor category) is a category C equipped with a bifunctor ⊗ : C × C → C which is associative up to a natural isomorphism, and an object I which is both a lef… graph-isomorphism× 125 isomorphic if they have a function $f$ which provides an exact pairing of vertices in the two graphs such that for any adjacent vertices $u,v\in \{\mbox{set of vertices of }… constants× 125 For questions about mathematical constants, that are "significantly interesting in some way". catalan-numbers× 124 For questions on Catalan numbers, a sequence of natural numbers that occur in various counting problems. golden-ratio× 124 Questions relating to the golden ratio$\varphi = \frac{1+\sqrt{5}}{2}$fractional-calculus× 124 Questions on the differentiation/integration of functions to arbitrary order. dirichlet-series× 124 For questions on Dirichlet series. reflection× 124 a transformation that fixes a line or plane or a more general subset. Reflections appear in geometry, linear algebra, complex analysis, differential equations, etc -- therefore, this ta… polylogarithm× 123 For questions about or related to polylogarithm functions. infinite-groups× 123 For questions about groups where the underlying set has infinite cardinality. taylor-series× 123 diophantine-approximation× 122 For questions about approximating real numbers by rational numbers. finitely-generated× 122 For questions regarding finitely generated groups. If S is finite, then a group$G = \langle S\rangle$is called finitely generated. constraints× 121 a condition of an optimization problem that the solution must satisfy. (Def: http://en.wikipedia.org/wiki/Constraint_(mathematics)) invariant-theory× 121 a branch of abstract algebra dealing with actions of groups on algebraic varieties, such as vector spaces, from the point of view of their effect on functions. (Def: http://en.m.wi… multisets× 120 For questions about or related to multisets, a notion similar to sets with the difference that elements can be repeated. morse-theory× 120 In the area of mathematics known as differential topology, Morse theory enables one to analyze the topology of a manifold by studying differentiable functions on that manifold. (Def: http://en.m.wikip… algebras× 120 For questions about algebras, their properties, and their structures. finite-rings× 120 refers to questions asked in the field of ring theory which, in particular, focus on rings of finite order. homogeneous-equation× 120 called homogeneous if the following condition is satisfied: If$\phi(x)$is a solution, so is$c \phi(x)$, where c is an arbitrary (non-zero) constant. (Def: http:… connections× 119 In mathematics, a connection on a fiber bundle is a device that defines a notion of parallel transport on the bundle; that is, a way to "connect" or identify fibers over nearby points. (Def: http://… semidirect-product× 119 a construction in group theory generalizing the direct product. It arises as the structure of a group$G$with a normal subgroup$N$having a complement$N$. quadratic-reciprocity× 118 In number theory, the law of quadratic reciprocity is a theorem about modular arithmetic that gives conditions for the solvability of quadratic equations modulo prime numbers. (Ref: http://en.m.wikipe… clifford-algebras× 118 associative algebras constructed from quadratic forms on vector spaces. They can be viewed as generalizations of the real numbers, complex numbers, and quaternions. These algebra… error-propagation× 117 For questions on propagation of errors. median× 117 For questions about the numerical value separating the higher half of a data sample, a population, or a probability distribution, from the lower half. maximal-ideals× 116 ideals which are contained in only one other ideal which is the ring itself. group-rings× 116 a ring constructed from a group$G$and ring$R\$. A special case of this construction is group algebra, which occurs naturally in representation theory.