# 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:
 adjoint-functors× 134 For questions about adjoint functors from category theory. Use in conjunction with the tag (category-theory). parametrization× 132 chain-rule× 131 For questions involving the chain rule in analysis. greens-function× 130 for questions about a Green's function which is the impulse response of an inhomogeneous differential equation defined on a domain, with specified initial conditions or boundary conditions… regression-analysis× 129 for questions about regression analysis. In statistical modeling, regression analysis is a statistical process for estimating the relationships among variables. It includes many techniques… matroids× 129 a common generalization of linearly independent sets and independent sets in graphs. Among other applications, they are exactly the simplical complexes in which the greedy algorithm outpu… idempotents× 129 For questions about elements which satisfy $x\cdot x=x$ where $\cdot$ is a composition law. perfect-numbers× 128 Questions about or involving perfect numbers which are positive integers that are equal to the sum of their proper positive divisors. uniform-integrability× 128 For questions about families of uniformly integrable random variables. Use the tags [tag: measure-theory] or [tag: probablity-theory]. ricci-flow× 127 The Ricci flow on a Riemannian manifold $(M,g)$ is determined by the geometric evolution equation $\partial_t g_{ij} = -2R_{ij}$ where $R_{ij}$ is the Ricci curvature. The Ricci flow is the main ingre… network× 127 quantum-field-theory× 127 In mathematical physics, constructive quantum field theory is the field whose objective is to establish existence theorems for models of quantum field theory. (Def: http://en.m.wikipedia.org/wiki/Co… quadrilateral× 126 For questions about general quadrilaterals (including parallelograms, trapezoids, rhombi) and their properties. formal-systems× 126 broadly defined as any well-defined system of abstract thought based on the model of mathematics. (Def: http://en.m.wikipedia.org/wiki/Formal_system) additive-combinatorics× 125 about giving combinatorial estimates of addition and subtraction operations on Abelian groups or other algebraic objects. Key words: sum set estimates, inverse theorems, grap… symbolic-computation× 124 Numeric computation usually uses floating point numbers. Symbolic computations use symbols, and can give exact answers, such as $\sum_{n=1}^\infty \frac{1}{n^2} = \frac{\pi^2}{6}$. Mathematica, Maple… big-picture× 123 Questions to get the "big picture" about a subject. ordered-fields× 123 fields which have an additional structure, a linear order compatible with the field structure. This tag is for questions regarding ordered fields and their properties, as well proof… project-euler× 122 a series of challenging mathematical/computer programming problems. Please see the site and rules before posting. poissons-equation× 121 a partial differential equation of elliptic type with broad utility in electrostatics, mechanical engineering and theoretical physics. (Def: http://en.m.wikiped… kahler-manifolds× 121 A complex manifold with a Hermitian metric is called a Kähler manifold if the (1,1) form that gives its Hermitian metric is a closed differential form. clustering× 121 grouping (partitioning) a set of objects so that items in the same group are more similar to each other than to items in different groups, where the notion of similarity may be variously… grassmannian× 121 In mathematics, the Grassmannian $\mathbf{Gr}(r, V)$ is a space which parameterizes all linear subspaces of a vector space $V$ of given dimension $r$. root-systems× 121 For questions involving abstract root systems, their associated Weyl groups and Dynkin diagrams, as well as their applications to Lie theory, graph theory, or other related fields. spherical-harmonics× 120 Questions on spherical harmonics, a set of basis functions that satisfy an orthogonality relation over the sphere. computational-algebra× 120 an area of algebra that seeks efficient algorithms to answer fundamental problems concerning basic algebraic objects (groups, rings, fields, etc.). For questions about generic… higher-category-theory× 120 the part of category theory at a higher order, which means that some equalities are replaced by explicit arrows in order to be able to explicitly study the st… invariance× 119 called invariant if, given some steps that alter the object, always remains, no matter what steps are used in what order. injective-module× 119 injective if $\hom_{R}({-},I)$ is exact. The notion of injective modules is dual to the notion of a projective module. In homological algebra injective modules are used… neural-networks× 119 used for mathematical formulae or questions related to neural networks. decision-theory× 119 For questions regarding formal decision problems. In contrast, questions involving strategic aspects (where the solution depends on the behavior of others) are discussed in game theory. uniform-spaces× 119 In the mathematical field of topology, a uniform space is a set with a uniform structure. (Def: http://en.m.wikipedia.org/wiki/Uniform_space) exponential-distribution× 117 To be used for questions on using, finding, or otherwise relating to Exponential Distributions. levy-processes× 117 Question related to Lévy processes, i.e. stochastically continuous processes with independent, stationary increments. collatz× 116 Dynamics of the iterated map $n \to 3n+1$ if $n$ is odd and $n \to \frac n2$ if $n$ is even. Generalizations to $n \to 3n-1$ or $n \to 5n+1$ or even to $n \to pn+q$ . Other names are "$3x+1$-proble… cauchy-integral-formula× 116 In mathematics, Cauchy's integral formula, named after Augustin-Louis Cauchy, is a central statement in complex analysis. It expresses the fact that a holomorphic function defined on a disk is complet…