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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Question on bits and pieces of mathematics that show up in popular media (TV, movies, comics, etc.)
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Question on minimal surfaces, or surfaces that have zero mean curvature.
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Questions about mathematicians and their lives.
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Question related to Lévy processes, i.e. stochastically continuous processes with independent, stationary increments.
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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…
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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…
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a computer algebra system distributed by the University of Sydney, and designed for solving problems in algebra, number theory, geometry and combinatorics.
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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 $N$.
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For questions regarding the mathematical analysis of voting systems and behavior. Examples include the median voter theorem or the Condorcet jury theorems.
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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…
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For questions on the subject of "satisfiability", that is, whether there exists an interpretation/model in which a given (logical) formula is true.
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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…
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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. …
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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…
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the lowest order monic polynomial satisfied by an object, such as a matrix or an algebraic element over a field.
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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".
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For question on extrapolation, the process of estimating, beyond the original observation interval.
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An ordinary differential equation that generalizes the notion of "path of steepest descent." For questions on "gradients" of a function, use (multivariable-calculus) instead.
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For questions on Gauss sums, a particular kind of finite sum of roots of unity.