# 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:
 nilpotence× 98 A nilpotent matrix has $A^n=0$ for some integer $n$. ricci-flow× 98 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… additive-combinatorics× 97 about giving combinatorial estimates of addition and subtraction operations on Abelian groups or other algebraic objects. Key words: sum set estimates, inverse theorems, grap… uniform-integrability× 97 For questions about families of uniformly integrable random variables. Use the tags [tag: measure-theory] or [tag: probablity-theory]. poissons-equation× 95 a partial differential equation of elliptic type with broad utility in electrostatics, mechanical engineering and theoretical physics. (Def: http://en.m.wikiped… localization× 95 For questions regarding the process, consequences, and stability of localizing algebraic structures such as rings, categories, and modules. Not for use with local topological spaces. kahler-manifolds× 95 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. research× 94 spectral-sequences× 94 (STUB) A method of computing homology groups by taking a sequence of approximations. Particularly useful in algebraic topology. formal-systems× 94 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) unit-of-measure× 94 For questions related to conversion of units. z-transform× 93 a discrete analogue to the Laplace transform, in that it maps a time domain signal into a representation in complex frequency plane. regularization× 93 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… projective-schemes× 93 invariance× 93 called invariant if, given some steps that alter the object, always remains, no matter what steps are used in what order. multiplicative-function× 92 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… quadrilateral× 92 For questions about general quadrilaterals (including parallelograms, trapezoids, rhombi) and their properties. grassmannian× 92 In mathematics, the Grassmannian $\mathbf{Gr}(r, V)$ is a space which parameterizes all linear subspaces of a vector space $V$ of given dimension $r$. hash-function× 92 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 $… spherical-harmonics× 91 Questions on spherical harmonics, a set of basis functions that satisfy an orthogonality relation over the sphere. semidefinite-programming× 91 idempotents× 91 For questions about elements which satisfy$x\cdot x=x$where$\cdot$is a composition law. levy-processes× 91 Question related to Lévy processes, i.e. stochastically continuous processes with independent, stationary increments. latin-square× 90 For questions on or pertaining to Latin squares. regression-analysis× 90 ceiling-function× 90 The function that maps a real number$x$to the smallest integer greater than or equal to$x$(which is often denoted$\lceil x\rceil$. See also (floor-function). decision-theory× 89 For questions regarding formal decision problems. In contrast, questions involving strategic aspects (where the solution depends on the behavior of others) are discussed in game theory. algorithmic-game-theory× 89 an area in the intersection of game theory and algorithm design, whose objective is to design algorithms in strategic environments. (Def: http://en.m.wikipedia.org/wiki/Al… career-development× 89 Questions on mathematical career development. Consider whether your question is more appropriate for Academia Stack Exchange. sage× 89 For questions concerning Sage. Consider whether your question would be a better fit at [ask Sage](http://ask.sagemath.org/). universal-property× 89 topological-k-theory× 88 a generalized cohomology theory, for which$K_0(X)$is the Grothendieck group of isomorphism classes of vector bundles over topological space$X\$. See also (algebraic-k-theory)… least-common-multiple× 88 For questions about the least common multiple of a collection of numbers (or more generally, elements of a commutative ring). newton-raphson× 88 big-numbers× 88 For questions relating to the computation, estimation and properties of extremely large quantities that are not usually used in mainstream mathematics. classical-analysis× 88