# 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:
 satisfiability× 72 For questions on the subject of "satisfiability", that is, whether there exists an interpretation/model in which a given (logical) formula is true. trigonometric-functions× 72 Questions involving the formulation or evaluation of trigonometric functions. graph-laplacian× 71 An simple graph has a symmetric matrix L = D - A associated with it called the Laplacian matrix, where D is the diagonal matrix of degrees and A is the adjacency matrix, often studied for its spectrum… elliptic-equations× 70 For questions about elliptic partial differential equations. If your question is specific to the Laplace equation, see (harmonic-functions). complex-manifolds× 70 For questions about complex manifolds. random-functions× 70 mean-square-error× 70 young-tableaux× 70 utility× 69 A tag for all questions involving a type of utility function. spherical-trigonometry× 69 legendre-symbol× 69 For questions involving the Legendre symbol, $\genfrac{(}{)}{}{}{a}{p}$ for integer $a$ and prime $p$. poisson-process× 69 formal-power-series× 69 galois-representations× 67 fuzzy-logic× 67 a form of many-valued logic that deals with approximate, rather than fixed and exact reasoning. (Def: http://en.m.wikipedia.org/wiki/Fuzzy_logic) simplicial-complex× 67 toric-geometry× 67 linear-approximation× 66 For questions about linear approximations, $f(x) \approx f(a)+f'(a)(x-a)$ for $x$ around $a$. linear-groups× 66 a group $G$ whose elements are invertible $n \times n$ matrices over a field $F$. gamma-distribution× 66 groupoids× 66 A groupoid (in the sense of category theory) is a small category in which every morphism is an isomorphism. Groupoids arise throughout mathematics, e.g. in guise of fundamental groupoids in the theory… chain-rule× 66 For questions involving the chain rule in analysis. blowup× 66 A technique in geometry (especially algebraic and differential, and by extension to study of pseudo-differential operators) for resolution of singularities. Not to be confused with the formation of si… classifying-spaces× 65 A classifying space $BG$ of a topological group $G$ is the quotient of a weakly contractible space $EG$ by a free action of $G$. When $G$ is a discrete group $BG$ has homotopy type of $K(G,1)$ and (co… goldbachs-conjecture× 65 For questions about Goldbach's conjecture: every even integer greater than two is the sum of two primes. calendar-computations× 64 for questions about combinatorial and computational issues with regards to calendar systems. A typical, well-known mathematical result in this direction is John Conway's Doomsday Algorithm… beta-function× 64 For questions about Beta function, a special function closely related to Gamma. It is advisable to also use [special-functions] tag with this one. automorphic-forms× 64 a generalization of the idea of periodic functions in Euclidean space to general topological groups. chemistry× 63 Questions related to mathematical chemistry which include application of mathematics to problems in chemistry and the development of mathematical methods suitable for such applications and for the for… mathematicians× 63 Questions about mathematicians and their lives. k-theory× 63 the study of invariants of large matrices, in a suitable sense. It has many variations: (algebraic-k-theory), (topological-k-theory), or in the study of (operator-algebras). parametrization× 63 variance× 63 quadratic-variation× 62 Questions on quadratic variations of stochastic processes. (Not to be confused with functions of bounded variation.) manifolds-with-boundary× 62 typically defined to be without boundaries (every point has a neighbourhood homeomorphic to an Euclidean open disc). Use this tag for the manifolds with boundaries, as well as manifolds … geometric-progressions× 62