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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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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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 related to Moebius inversion and its applications.
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A brief study of transcendental numbers and algebraic independence theories; currently an on-development branch of mathematics with a lot of open problems.
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For questions about vector lattices (aka. Riesz spaces; a type of vector space equipped with a partial order), Banach lattices and similar topics.
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In mathematics the Chebyshev polynomials, named after Pafnuty Chebyshev, are a sequence of orthogonal polynomials which are related to de Moivre's formula and which can be defined recursively.
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For questions about the concept of "almost everywhere", that is, questions about properties which holds everywhere, except on a set of measure $0$. This is involved in probability theory as well as in…
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For questions on the octonions, a normed division algebra over the real numbers. It is a non-associative higher-dimensional analogue in the hierarchy of real, complex, and quaternionic numbers.
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For questions concerning pro-$p$ groups. These groups arise naturally in topology, algebraic number theory or Galois theory and are a special case of pro-finite groups.
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For problems involving either the product of the first n primes or the product of all primes up to and including n.
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For questions regarding profinite groups and their properties.
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a number or ratio expressed as a fraction of $100$. It is often denoted using the percent sign, "$\%$", or the abbreviation "$\mathrm{pct}$." -Wikipedia. Percentages are used when desc…
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To be used with questions about continuous homomorphisms into a space carrying both a topological and an algebraic structure.
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For questions regarding Simpson's rule and its applications.
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For questions related to theory of semigroups of linear operators and its applications to partial differential equations, stochastic processes such as Markov processes and other branches of mathematic…
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a probability puzzle with a solution that is counterintuitive to many.
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For questions about mixing in ergodic or probability theory.