# 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:
 cauchy-integral-formula× 115 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… least-common-multiple× 115 For questions about the least common multiple of a collection of numbers (or more generally, elements of a commutative ring). pseudoinverse× 115 The operator which best approximates a solution to a linear system with a singular (non-invertible) matrix.: e.g., the Moore-Penrose pseudoinverse. Use when a question concerns a matrix that is probab… coherent-sheaves× 114 In mathematics, especially in algebraic geometry and the theory of complex manifolds, coherent sheaves are a specific class of sheaves having particularly manageable properties closely linked to the g… associativity× 114 the property shared by many binary operations including group operations. For a binary operation $\cdot$, associativity holds if $(x\cdot y)\cdot z = x \cdot(y\cdot z)$. bifurcation× 112 the mathematical study of changes in the qualitative or topological structure of a given family, such as the integral curves of a family of vector fields, and the solutions of a … prime-twins× 112 For questions on prime twins. kinematics× 112 stationary-processes× 112 For questions about strictly stationary or stationary in the wide sense sequences or processes. Questions about deterministic stationary processes (in the case of discrete dynamical systems) are welco… greens-theorem× 111 for questions about Green's theorem. Green's theorem gives the relationship between a line integral around a simple closed curve $C$ and a double integral over the plane region $D$ bounded… cantor-set× 111 Questions concerning the Cantor set, which consists of those real numbers in [0,1] that remain after repeatedly removing the open middle third of every interval; it contains those numbers which may be… abelian-varieties× 110 In mathematics, particularly in algebraic geometry, complex analysis and number theory, an abelian variety is a projective algebraic variety that is also an algebraic group, i.e., has a group law that… hash-function× 110 For questions about hash functions: functions from a big set to a smaller one such that the same output $f(x_1)=f(x_2)$ for different input $x_1\ne x_2$ is unlikely, especially if $x_2$ differs from $… pell-type-equations× 110 Questions on finding integer solutions to bivariate equations of the form$x^2-Dy^2=a$. big-numbers× 109 For questions relating to the computation, estimation and properties of extremely large quantities that are not usually used in mainstream mathematics. formal-grammar× 109 In formal language theory, a grammar (when the context is not given, often called a formal grammar for clarity) is a set of production rules for strings in a formal language. A formal grammar is a set… sage× 109 For questions concerning Sage. Consider whether your question would be a better fit at [ask Sage](http://ask.sagemath.org/). universal-property× 108 graded-modules× 108 orientation× 108 For question regarding the notion of orientation both in topology and in global analysis. initial-value-problems× 108 about questions regarding Initial value problems. In the field of differential equations, an initial value problem is an ordinary differential equation together with a specified value, cal… limits-colimits× 107 For questions about categorical limits and colimits. projective-schemes× 107 ceiling-function× 107 The function that maps a real number$x$to the smallest integer greater than or equal to$x$(which is often denoted$\lceil x\rceil$. See also (floor-function). borel-cantelli-lemmas× 106 For questions involving the Borel-Cantelli Lemma or the second Borel-Cantelli Lemma. Use this tag along with (probability-theory), (real-analysis) or (measure-theory) regularization× 106 Regularization, in mathematics and statistics and particularly in the fields of machine learning and inverse problems, refers to a process of introducing additional information in order to solve an il… multiplicative-function× 104 In number theory, a multiplicative function is a function defined on positive integers such that f(ab)=f(a)f(b) for a,b coprime. E.g. Euler's totient function, sum of divisors and number of divisor… latin-square× 104 For questions on or pertaining to Latin squares. meta-math× 104 the term for the theory in which mathematics is formalized (often PA, ZFC or similar theories). Meta-mathematical statements are statements which are evaluated at the level of the meta-… schwartz-space× 104 For question about the Schwartz space, a vector space of smooth functions stable under the Fourier transform. research× 104 karush-kuhn-tucker× 103 In mathematical optimization, the Karush–Kuhn–Tucker (KKT) conditions are first order necessary conditions for a solution in nonlinear programming to be optimal, provided that some regularity conditio… affine-schemes× 103 The spectrum of a commutative ring with unit is the set of prime ideals endowed with the Zariski topology. One can define a sheaf of rings on this space : to each Zariski-open set is assigned a commut… algorithmic-game-theory× 103 an area in the intersection of game theory and algorithm design, whose objective is to design algorithms in strategic environments. (Def: http://en.m.wikipedia.org/wiki/Al… convex-geometry× 102 when posting questions related to the concept of convexity and geometry. For example, for convex polygons. eulers-constant× 102 For questions related to Euler's constant$\gamma\$, which is defined to be the limiting difference between the natural logarithm and the harmonic series.