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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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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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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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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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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ideals which are contained in only one other ideal which is the ring itself.
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For properties of knots that remain unaffected by Reidmaster moves
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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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a card game with several variants (Draw, Texas Hold'em, ...), the common goal being to collect face value patterns such as "four of a kind", "full house" or "straight" or all of a suit ("flus…
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symmetric in its arguments.
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A branch of topology that deals with the notion of a fiber bundle.
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For questions about or involving geometric series, a series where successive terms have a common ratio.
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The utilization of advanced computing technology in mathematical research: new mathematical results discovered partly or entirely with the aid of computer-based tools.
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In mathematics, particularly in algebraic geometry, complex analysis and number theory, an abelian variety is a projective algebraic variety that is also an algebraic group, i.e., has a group law that…
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the property shared by many binary operations including group operations. For a binary operation $\cdot$, associativity holds if $(x\cdot y)\cdot z = x \cdot(y\cdot z)$.
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Question on minimal surfaces, or surfaces that have zero mean curvature.
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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. …
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Questions on finding integer solutions to a certain kind of bivariate equations.
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an area in the intersection of game theory and algorithm design, whose objective is to design algorithms in strategic environments. (Def: http://en.m.wikipedia.org/wiki/Al…
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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 related to Euler's constant, which is defined to be the limiting difference between the natural logarithm and the harmonic series.
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An simple graph has a symmetric matrix L = D - A associated with it called the Laplacian matrix, where D is the diagonal matrix of degrees and A is the adjacency matrix, often studied for its spectrum…
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meant for questions which are generalized forms of questions which get asked frequently. See tag details for more information.
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For questions about artificial intelligence.
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Questions on the mathematics behind the famed toy invented by Ernő Rubik.
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For question on Tessellations, the process of creating a two-dimensional plane using the repetition of a geometric shape with no overlaps and no gaps.
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For question about the Schwartz space, a vector space of smooth functions stable under the Fourier transform.
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a branch of mathematical physics that studies, using probability theory, the average behaviour of a mechanical system where the state of the system is uncertain. (Def: http:…
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The operator $A^+$ which best approximates a solution to linear equations $Ax+b=0$ even if $A$ is singular.
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a mathematical term that describes the property of an integer's inclusion in one of two categories: even or odd. An integer is even if it is 'evenly divisible' by two and odd if it is not ev…
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For questions regarding the theory and evaluation of the Gaussian integral, also known as the Euler–Poisson integral .
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An ordinary differential equation that generalizes the notion of "path of steepest descent." For questions on "gradients" of a function, use (multivariable-calculus) instead.
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For questions about complex manifolds.
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a generalization of the idea of periodic functions in Euclidean space to general topological groups.