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 related to arithmetic progressions (sequences with a constant difference between the terms)
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grouping (partitioning) a set of objects so that items in the same group are more similar to each other than to items in different groups, where the notion of similarity may be variously…
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a subfield of Euclidean geometry, restricted to the flat two-dimensional space. Plane geometry studies shapes, ratios and relative locations of 2D figures which can be embedded into …
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For questions involving abstract root systems, their associated Weyl groups and Dynkin diagrams, as well as their applications to Lie theory, graph theory, or other related fields.
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A complex manifold with a Hermitian metric is called a Kähler manifold if the (1,1) form that gives its Hermitian metric is a closed differential form.
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about giving combinatorial estimates of addition and subtraction operations on Abelian groups or other algebraic objects. Key words: sum set estimates, inverse theorems, grap…
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For questions about elements which satisfy $x\cdot x=x$ where $\cdot$ is a composition law.
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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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For questions about adjoint functors from category theory. Use in conjunction with the tag (category-theory).
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For questions about families of uniformly integrable random variables. Use the tags [tag: measure-theory] or [tag: probablity-theory].
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For questions about general quadrilaterals (including parallelograms, trapezoids, rhombi) and their properties.
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a partial differential equation of elliptic type with broad utility in electrostatics, mechanical engineering and theoretical physics. (Def: http://en.m.wikiped…
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In mathematics, the Grassmannian $\mathbf{Gr}(r, V)$ is a space which parameterizes all linear subspaces of a vector space $V$ of given dimension $r$.
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In calculus of variations, the Euler–Lagrange equation, Euler's equation, or Lagrange's equation, is a second-order partial differential equation whose solutions are the functions for which a given fu…
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broadly defined as any well-defined system of abstract thought based on the model of mathematics. (Def: http://en.m.wikipedia.org/wiki/Formal_system)
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called invariant if, given some steps that alter the object, always remains, no matter what steps are used in what order.
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For questions related to conversion of units.
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(STUB) A method of computing homology groups by taking a sequence of approximations. Particularly useful in algebraic topology.
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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 hash functions: functions from a big set to a smaller one such that the same output $f(x_1)=f(x_2)$ for different input $x_1\ne x_2$ is unlikely, especially if $x_2$ differs from $…
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The spectrum of a commutative ring with unit is the set of prime ideals endowed with the Zariski topology. One can define a sheaf of rings on this space : to each Zariski-open set is assigned a commut…
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The function that maps a real number $x$ to the smallest integer greater than or equal to $x$ (which is often denoted $\lceil x\rceil$. See also (floor-function).
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Question related to Lévy processes, i.e. stochastically continuous processes with independent, stationary increments.
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Regularization, in mathematics and statistics and particularly in the fields of machine learning and inverse problems, refers to a process of introducing additional information in order to solve an il…
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Questions on spherical harmonics, a set of basis functions that satisfy an orthogonality relation over the sphere.
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For questions about the least common multiple of a collection of numbers (or more generally, elements of a commutative ring).
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For questions relating to the computation, estimation and properties of extremely large quantities that are not usually used in mainstream mathematics.
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In mathematics, especially in algebraic geometry and the theory of complex manifolds, coherent sheaves are a specific class of sheaves having particularly manageable properties closely linked to the g…
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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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In formal language theory, a grammar (when the context is not given, often called a formal grammar for clarity) is a set of production rules for strings in a formal language. A formal grammar is a set…