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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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 prime-ideals× 75 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) spheres× 74 For geometrical problems involving spheres. Use the tag (geometry) as well. For intrinsic geometry of spheres, see (spherical-geometry). spherical-harmonics× 74 Questions on spherical harmonics, a set of basis functions that satisfy an orthogonality relation over the sphere. constraints× 74 a condition of an optimization problem that the solution must satisfy. (Def: http://en.m.wikipedia.org/wiki/Constraint_(mathematics)) bifurcation× 74 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 … bipartite-graph× 73 For questions about graphs with two sets of distinct vertices in which edges join vertices from different sets. combinatorial-designs× 73 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… division-algebras× 73 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… formal-grammar× 72 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… computational-algebra× 72 an area of algebra that seeks efficient algorithms to answer fundamental problems concerning basic algebraic objects (groups, rings, fields, etc.). For questions about generic… noncommutative-geometry× 72 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… nilpotence× 70 A nilpotent matrix has $A^n=0$ for some integer $n$. model-categories× 70 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… complex-dynamics× 70 the study of dynamical systems of functions over complex numbers. universal-property× 70 z-transform× 70 a discrete analogue to the Laplace transform, in that it maps a time domain signal into a representation in complex frequency plane. big-numbers× 69 For questions relating to the computation, estimation and properties of extremely large quantities that are not usually used in mainstream mathematics. hodge-theory× 69 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 … grassmannian× 69 In mathematics, the Grassmannian $\mathbf{Gr}(r, V)$ is a space which parameterizes all linear subspaces of a vector space $V$ of given dimension $r$. levy-processes× 69 Question related to Lévy processes, i.e. stochastically continuous processes with independent, stationary increments. regularity-theory-of-pdes× 69 The concept of regularity concerns the smoothness of weak solutions to partial differential equations. collatz× 68 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… ceiling-function× 67 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). quadrilateral× 67 For questions about general quadrilaterals (including parallelograms, trapezoids, rhombi) and their properties. prime-twins× 66 For questions on prime twins. rigid-transformation× 66 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… sieve-theory× 66 Sieve theory deals with number theoretic sieves, and sifted sets. E.g. the Sieve of Eratosthenes, Brun sieve, and other modern sives. meta-math× 66 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-… poissons-equation× 66 a partial differential equation of elliptic type with broad utility in electrostatics, mechanical engineering and theoretical physics. (Def: http://en.m.wikiped… affine-schemes× 66 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… bochner-spaces× 65 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. multiplicative-function× 65 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… translation-request× 65 for requests to translate written mathematical material from one language to another. utility× 65 A tag for all questions involving a type of utility function. stationary-processes× 63 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… nets× 62 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. …