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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The study of relations between, one the one hand, the topology of a smooth manifold as encoded in the cohomology groups, and on the other, the set of solutions to the Laplace operator on differential …
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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 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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For questions on prime twins.
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For questions about Combinatorial design theory, a part of combinatorial mathematics that deals with the existence, construction and properties of systems of finite sets whose arrangements satisfy gen…
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A tag for all questions involving a type of utility function.
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For questions about $\theta$ functions.
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The study of how mathematical objects (complex manifolds, associative algebras, Lie algebras) can be deformed into similar mathematical objects, at least infinitesimally.
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a ring constructed from a group $G$ and ring $R$. A special case of this construction is group algebra, which occurs naturally in representation theory.
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For questions regarding the rank of matrices in linear algebra.
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Question related to Lévy processes, i.e. stochastically continuous processes with independent, stationary increments.
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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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For questions about algebras, their properties, and their structures.
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For question on Tessellations, the process of creating a two-dimensional plane using the repetition of a geometric shape with no overlaps and no gaps.
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Questions about mathematicians and their lives.
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Question on minimal surfaces, or surfaces that have zero mean curvature.
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an associative ring without necessarily having a multiplicative identity (rng = ring - $i$dentity).
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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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The splitting field of a polynomial with coefficients in a field, F, is the smallest field extension to F such that the polynomial decomposes into linear factors. Often used with Galois-theory tag.
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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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for questions related to absolute convergence a series.
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