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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.

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 abelian-varieties× 34 groebner-basis× 34 popular-math× 33 Question on bits and pieces of mathematics that show up in popular media (TV, movies, comics, etc.) minimal-surfaces× 32 Question on minimal surfaces, or surfaces that have zero mean curvature. mathematicians× 32 Questions about mathematicians and their lives. fibration× 32 levy-processes× 32 Question related to Lévy processes, i.e. stochastically continuous processes with independent, stationary increments. chemistry× 32 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… binary-operations× 32 dimensional-analysis× 32 direct-sum× 31 cw-complexes× 31 classifying-spaces× 31 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… magma-cas× 31 a computer algebra system distributed by the University of Sydney, and designed for solving problems in algebra, number theory, geometry and combinatorics. parity× 31 relation-algebra× 31 semidirect-product× 30 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 $N$. statistical-mechanics× 30 homogeneous-equation× 30 experimental-mathematics× 30 voting-theory× 30 For questions regarding the mathematical analysis of voting systems and behavior. Examples include the median voter theorem or the Condorcet jury theorems. universal-property× 29 coherent-sheaves× 29 stationary-processes× 29 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… undergraduate-research× 29 research× 29 satisfiability× 29 For questions on the subject of "satisfiability", that is, whether there exists an interpretation/model in which a given (logical) formula is true. poker× 29 a card game with several variants (Draw, Texas Hold'em, ...), the common goal being to collect face value patterns such as "four of a kind", "full house" or "straight" or all of a suit ("flus… nets× 29 a generalization of a sequence where a directed set is used as the index set instead of positive integers. Convergence of nets can be defined in a similar way as convergence of sequences. … multiplicative-function× 28 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… minimal-polynomials× 28 the lowest order monic polynomial satisfied by an object, such as a matrix or an algebraic element over a field. parameter-estimation× 28 separation-axioms× 28 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". extrapolation× 28 For question on extrapolation, the process of estimating, beyond the original observation interval. gradient-flows× 28 An ordinary differential equation that generalizes the notion of "path of steepest descent." For questions on "gradients" of a function, use (multivariable-calculus) instead. gauss-sums× 28 For questions on Gauss sums, a particular kind of finite sum of roots of unity.