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 subset of a ring that shares many important properties of a prime number in the ring of integers. (Def: http://en.m.wikipedia.org/wiki/Prime_ideal)
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For geometrical problems involving spheres. Use the tag (geometry) as well. For intrinsic geometry of spheres, see (spherical-geometry).
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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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a condition of an optimization problem that the solution must satisfy. (Def: http://en.m.wikipedia.org/wiki/Constraint_(mathematics))
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the mathematical study of changes in the qualitative or topological structure of a given family, such as the integral curves of a family of vector fields, and the solutions of a …
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For questions about graphs with two sets of distinct vertices in which edges join vertices from different sets.
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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 vector spaces over a field $F$ equipped with a bilinear product and a multiplicative neutral element $1$. All the non-zero elements of $D$ have a multiplicative inverse. As…
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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…
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an area of algebra that seeks efficient algorithms to answer fundamental problems concerning basic algebraic objects (groups, rings, fields, etc.). For questions about generic…
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a study of noncomutative algebras from geometrical point of view. The motivation of this approach is Gelfand representation theorem, which shows that every commutative C*-al…
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A nilpotent matrix has $A^n=0$ for some integer $n$.
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categories with three distinguished classes of morphisms: the weak equivalences, the fibrations and the cofibrations. They provide a natural setting for [tag:homotopy-theory] in a…
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the study of dynamical systems of functions over complex numbers.
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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 relating to the computation, estimation and properties of extremely large quantities that are not usually used in mainstream mathematics.
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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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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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Question related to Lévy processes, i.e. stochastically continuous processes with independent, stationary increments.
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The concept of regularity concerns the smoothness of weak solutions to partial differential equations.
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Dynamics of the iterated map $n \to 3n+1$ if $n$ is odd and $n \to \frac n2 $ if $n$ is even. Generalizations to $n \to 3n-1 $ or $ n \to 5n+1$ or even to $n \to pn+q$ . Other names are "$3x+1$-proble…
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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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For questions about general quadrilaterals (including parallelograms, trapezoids, rhombi) and their properties.
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For questions on prime twins.
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mappings from one reference frame to another reference frame in the Euclidean space $\mathbb R^n$. They comprise translation, rotation (and sometimes reflection). More for…
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Sieve theory deals with number theoretic sieves, and sifted sets. E.g. the Sieve of Eratosthenes, Brun sieve, and other modern sives.
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the term for the theory in which mathematics is formalized (often PA, ZFC or similar theories). Meta-mathematical statements are statements which are evaluated at the level of the meta-…
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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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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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For question involving Bochner space, which are generalization $\mathbb L^p$ spaces in the sense that the values of the functions are themselves in function spaces.
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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 requests to translate written mathematical material from one language to another.
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A tag for all questions involving a type of utility function.
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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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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. …