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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Questions about mathematicians and their lives.
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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 prime twins.
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Inverse problems involve for example reconstruction of an object based on physical measurements and finding a best model/parameters out of a family given observed data. Typically the corresponding "fo…
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For question on extrapolation, the process of estimating, beyond the original observation interval.
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The function that maps a real number x to the smallest integer not less than x. (See also (floor-function).)
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For questions about general quadrilaterals (including parallelograms, trapezoids, rhombi) and their properties.
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an associative ring without necessarily having a multiplicative identity (rng = ring - $i$dentity).
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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…
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In the philosophy of mathematics, intuitionism, or neointuitionism (opposed to preintuitionism), is an approach where mathematics is considered to be purely the result of the constructive mental activ…
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a discrete analogue to the Laplace transform, in that it maps a time domain signal into a representation in complex frequency plane.
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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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a group $G$ whose elements are invertible $n \times n$ matrices over a field $F$.
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a set together with a binary operation on this set. (For questions about the computer algebra system named Magma, use the [magma-cas] tag instead.)
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For questions involving rings of positive characteristic, particularly those questions whose statements and hypotheses heavily rely on positive characteristic. Consider using the ring-theory tag for …
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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…
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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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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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For questions about Coxeter groups, an abstract group that admits a formal description in terms of reflections.