# 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:
 sorting× 160 For questions about dividing groups of objects based on their properties. solvable-groups× 159 For questions on solvable groups, their properties, and structure. separation-axioms× 159 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". semidirect-product× 159 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 $N$. connections× 159 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://… poisson-process× 159 principal-bundles× 157 a mathematical object which formalizes some of the essential features of the Cartesian product $X\times G$ of a space $X$ with a group $G$. infinitary-combinatorics× 157 For topics of a combinatorial character in set theory. Topics belonging to "combinatorial set theory" may be tagged this way. These include: Partition calculus, diamond principles, square principles, … catalan-numbers× 157 For questions on Catalan numbers, a sequence of natural numbers that occur in various counting problems. branch-cuts× 157 curve in the complex extending from a branch point of the function. angle× 156 An object formed by two rays joining at a common point, or a measure of rotation. In the latter form, it is commonly in degrees or radians. error-function× 156 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. elliptic-integrals× 155 Questions on elliptic integrals, integrals that involve the square root of a cubic or quartic polynomial. diophantine-approximation× 155 For questions about approximating real numbers by rational numbers. golden-ratio× 155 Questions relating to the golden ratio $\varphi = \frac{1+\sqrt{5}}{2}$ bernoulli-numbers× 155 Questions on Bernoulli numbers, a special sequence of rational numbers that arise as the coefficients in the power series expansions of certain elementary functions. isometry× 155 a map between metric spaces that preserves the distance. This tag is for questions relating to isometries. monoidal-categories× 155 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… optimal-control× 155 Optimal control theory, an extension of the calculus of variations, is a mathematical optimization method for deriving control policies. (Def: http://en.m.wikipedia.org/wiki/Optimal_control) homogeneous-equation× 154 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:… infinite-groups× 153 For questions about groups where the underlying set has infinite cardinality. newton-raphson× 153 for questions regarding the Newton–Raphson method. In numerical analysis the Newton–Raphson method is a method for finding successively better approximations to the roots (or zeroes) of a … article-writing× 153 Various aspects of writing mathematics such as style, notation, grammar, frequently used phrases and common mistakes. group-rings× 152 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. riemann-hypothesis× 152 Questions on the Riemann hypothesis, a conjecture on the behavior of the complex zeros of the Riemann $\zeta$ function. You might want to add the tag [riemann-zeta] to your question as well. wavelets× 152 For questions related to wavelets and wavelet theory constants× 151 For questions about mathematical constants, that are "significantly interesting in some way". reflection× 149 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… modal-logic× 149 Questions relating to deductions relating to the expressions "it is necessary that" and "it is possible that" infinitesimals× 148 For questions about infinitesimals, both in an intuitive sense as well as more rigorous settings (see also [nonstandard-analysis]). quantum-groups× 148 In mathematics and theoretical physics, the term quantum group denotes various kinds of noncommutative algebra with additional structure. (Def: http://en.m.wikipedia.org/wiki/Quantum_group) positive-definite× 145 For questions regarding the positive-definiteness of matrices. absolute-convergence× 145 for questions related to absolute convergence a series. bipartite-graph× 145 For questions about graphs with two sets of distinct vertices in which edges join vertices from different sets. gaussian-integral× 144 For questions regarding the theory and evaluation of the Gaussian integral, also known as the Euler–Poisson integral . vector-space-isomorphism× 144 should be used for questions about isomorphisms between vector spaces.