# Tags

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.

 Type to find tags:
 catalan-numbers× 143 For questions on Catalan numbers, a sequence of natural numbers that occur in various counting problems. bernoulli-numbers× 143 Questions on Bernoulli numbers, a special sequence of rational numbers that arise as the coefficients in the power series expansions of certain elementary functions. semidirect-product× 142 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 $N$. article-writing× 141 Various aspects of writing mathematics such as style, notation, grammar, frequently used phrases and common mistakes. error-function× 141 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. network-flow× 140 For questions about networks that inhibit source and sink nodes and a notion of flow. locally-compact-groups× 139 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… maximal-ideals× 138 ideals which are contained in only one other ideal which is the ring itself. wavelets× 138 For questions related to wavelets and wavelet theory operations-research× 137 is a discipline to apply analytical methods for better decisions. It has many synonyms such as management science, decision science and system science. quantum-groups× 136 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) modal-logic× 136 Questions relating to deductions relating to the expressions "it is necessary that" and "it is possible that" diophantine-approximation× 136 For questions about approximating real numbers by rational numbers. group-rings× 136 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. hamiltonian-path× 135 A path in a graph that visits each vertex exactly once. constraints× 135 a condition of an optimization problem that the solution must satisfy. (Def: http://en.wikipedia.org/wiki/Constraint_(mathematics)) constants× 135 For questions about mathematical constants, that are "significantly interesting in some way". monoidal-categories× 135 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… infinite-groups× 135 For questions about groups where the underlying set has infinite cardinality. polylogarithm× 135 For questions about or related to polylogarithm functions. reflection× 134 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… infinitesimals× 134 For questions about infinitesimals, both in an intuitive sense as well as more rigorous settings (see also [nonstandard-analysis]). multinomial-coefficients× 133 For questions related to multinomial coefficients, a generalization of binomial coefficients. homogeneous-equation× 133 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:… finitely-generated× 132 For questions regarding finitely generated groups. If S is finite, then a group $G = \langle S\rangle$ is called finitely generated. golden-ratio× 131 Questions relating to the golden ratio $\varphi = \frac{1+\sqrt{5}}{2}$ fractional-calculus× 131 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… legendre-polynomials× 131 For questions about Legendre polynomials, which are solutions to a particular differential equation that frequently arises in physics. dirichlet-series× 130 For questions on Dirichlet series. connections× 130 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://… morse-theory× 129 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… localization× 129 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. vector-space-isomorphism× 129 should be used for questions about isomorphisms between vector spaces. graded-rings× 128 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… euclidean-algorithm× 127 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… finite-rings× 126 refers to questions asked in the field of ring theory which, in particular, focus on rings of finite order.