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 questions on Catalan numbers, a sequence of natural numbers that occur in various counting problems.
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Questions on Bernoulli numbers, a special sequence of rational numbers that arise as the coefficients in the power series expansions of certain elementary functions.
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a construction in group theory generalizing the direct product. It arises as the structure of a group $G$ with a normal subgroup $N$ having a complement $N$.
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Various aspects of writing mathematics such as style, notation, grammar, frequently used phrases and common mistakes.
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for the error and complementary error functions (erf and erfc). These are special functions formed by taking definite integrals of the Gaussian/normal distribution function.
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For questions about networks that inhibit source and sink nodes and a notion of flow.
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among the main objects of study of abstract harmonic analysis. They arise e.g. in number theory, abstract Fourier analysis, representation theory, Lie theory, operator theor…
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ideals which are contained in only one other ideal which is the ring itself.
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For questions related to wavelets and wavelet theory
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is a discipline to apply analytical methods for better decisions. It has many synonyms such as management science, decision science and system science.
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In mathematics and theoretical physics, the term quantum group denotes various kinds of noncommutative algebra with additional structure. (Def: http://en.m.wikipedia.org/wiki/Quantum_group)
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Questions relating to deductions relating to the expressions "it is necessary that" and "it is possible that"
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For questions about approximating real numbers by rational numbers.
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a ring constructed from a group $G$ and ring $R$. A special case of this construction is group algebra, which occurs naturally in representation theory.
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A path in a graph that visits each vertex exactly once.
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a condition of an optimization problem that the solution must satisfy. (Def: http://en.wikipedia.org/wiki/Constraint_(mathematics))
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For questions about mathematical constants, that are "significantly interesting in some way".
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In mathematics, a monoidal category (or tensor category) is a category C equipped with a bifunctor ⊗ : C × C → C which is associative up to a natural isomorphism, and an object I which is both a lef…
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For questions about groups where the underlying set has infinite cardinality.
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For questions about or related to polylogarithm functions.
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a transformation that fixes a line or plane or a more general subset. Reflections appear in geometry, linear algebra, complex analysis, differential equations, etc -- therefore, this ta…
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For questions about infinitesimals, both in an intuitive sense as well as more rigorous settings (see also [nonstandard-analysis]).
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For questions related to multinomial coefficients, a generalization of binomial coefficients.
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called homogeneous if the following condition is satisfied: If $\phi(x)$ is a solution, so is $c \phi(x)$, where c is an arbitrary (non-zero) constant. (Def: http:…
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For questions regarding finitely generated groups. If S is finite, then a group $G = \langle S\rangle$ is called finitely generated.
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Questions relating to the golden ratio $\varphi = \frac{1+\sqrt{5}}{2}$
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Questions on the differentiation/integration of functions to arbitrary order. Fractional calculus is a branch of mathematical analysis that studies the possibility of taking real number powers or comp…
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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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For questions on Dirichlet series.
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In mathematics, a connection on a fiber bundle is a device that defines a notion of parallel transport on the bundle; that is, a way to "connect" or identify fibers over nearby points. (Def: http://…
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In the area of mathematics known as differential topology, Morse theory enables one to analyze the topology of a manifold by studying differentiable functions on that manifold. (Def: http://en.m.wikip…
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For questions regarding the process, consequences, and stability of localizing algebraic structures such as rings, categories, and modules. Not for use with local topological spaces.
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should be used for questions about isomorphisms between vector spaces.
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In mathematics, in particular abstract algebra, a graded ring is a ring that is a direct sum of abelian groups $R_i$ such that $R_i R_j \subset R_{i+j}$. (Def: http://en.m.wikipedia.org/wiki/Graded_ri…
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For questions about the uses of the Euclidean algorithm, Extended Euclidean algorithm, and related algorithms in integers, polynomials, or general Euclidean domains. This is **not** about Euclidean ge…
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refers to questions asked in the field of ring theory which, in particular, focus on rings of finite order.