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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For question on extrapolation, the process of estimating, beyond the original observation interval.
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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 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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For questions about algebras, their properties, and their structures.
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For questions about or related to polylogarithm functions.
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For questions about various search algorithms.
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Questions dealing with set-theoretic functions defined by transfinite recursion.
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The Ricci flow on a Riemannian manifold $(M,g)$ is determined by the geometric evolution equation $\partial_t g_{ij} = -2R_{ij}$ where $R_{ij}$ is the Ricci curvature. The Ricci flow is the main ingre…
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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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a group $G$ whose elements are invertible $n \times n$ matrices over a field $F$.
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A commutative ring in which every non-zero non-unit element can be written as a product of prime elements, and where this product is unique up to ordering and units. Also called UFD or "factorial ring…
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injective if $\hom_{R}({-},I)$ is exact. The notion of injective modules is dual to the notion of a projective module. In homological algebra injective modules are used…
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The study of geometry of manifolds without appealing to differential calculus. It includes studies of length spaces, Alexandrov spaces, and CAT(k) spaces. The techniques are often applicable to Rieman…
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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 pertaining to power towers: expressions like a^(b^(c^d))), which result from iterated exponentiation. The "hyperoperation" tag may be appropriate, too.
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for questions pretaining to q-analogs of functions, for example q-Binomials, $q$-derivatives, the q-theta function, the q-Pochammer symbol, etc.
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For questions regarding the formal analysis of collective decision problems.
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For questions about topological graph theory.
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a functor from a category to itself together with two natural transformations, commonly called μ (the "multiplication") and η (the "unit"), satisfying conditions that make μ monoidal and η …
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for questions related to absolute convergence a series.
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Kolmogorov complexity concerns the size of the shortest program that generates a given string.
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For questions about Legendre polynomials, which are solutions to a particular differential equation that frequently arises in physics.
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