# 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:
 median× 107 For questions about the numerical value separating the higher half of a data sample, a population, or a probability distribution, from the lower half. sums-of-squares× 107 For questions concerning various representation of integers as sums of squares, which are studied in number theory. reflection× 106 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… potential-theory× 106 Potential theory concerns solutions of elliptic partial differential equations (especially Laplace's equation) that are represented by integration against a measure or a more general distribution. multisets× 106 For questions about or related to multisets, a notion similar to sets with the difference that elements can be repeated. operations-research× 106 is a discipline to apply analytical methods for better decisions. It has many synonyms such as management science, decision science and system science. matroids× 105 a common generalization of linearly independent sets and independent sets in graphs. Among other applications, they are exactly the simplical complexes in which the greedy algorithm outpu… semidirect-product× 105 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 $N$. group-rings× 105 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. hopf-algebras× 105 For questions about Hopf algebras and related concepts, such as quantum groups. golden-ratio× 105 Questions relating to the golden ratio $\varphi = \frac{1+\sqrt{5}}{2}$ graph-isomorphism× 103 isomorphic if they have a function $f$ which provides an exact pairing of vertices in the two graphs such that for any adjacent vertices $u,v\in \{\mbox{set of vertices of }… dirichlet-series× 102 For questions on Dirichlet series. binomial-distribution× 102 In probability theory and statistics, the binomial distribution with parameters n and p is the discrete probability distribution of the number of successes in a sequence of n independent yes/no experi… line-integrals× 102 an integral where the function to be integrated is evaluated along a curve. The terms path integral, curve integral, and curvilinear integral are also used. monoidal-categories× 101 In mathematics, a monoidal category (or tensor category) is a category C equipped with a bifunctor ⊗ : C × C → C which is associative up to a natural isomorphism, and an object I which is both a lef… dihedral-groups× 101 For questions on dihedral groups, the group of symmetries of a regular polygon, including both rotations and reflections finitely-generated× 101 For questions regarding finitely generated groups. If S is finite, then a group$G = \langle S\rangle$is called finitely generated. infinite-groups× 101 For questions about groups where the underlying set has infinite cardinality. derived-functors× 100 In mathematics, certain functors may be derived to obtain other functors closely related to the original ones. (Def: http://en.m.wikipedia.org/wiki/Derived_functor) spheres× 100 For geometrical problems involving spheres. Use the tag (geometry) as well. For intrinsic geometry of spheres, see (spherical-geometry). sheaf-cohomology× 100 the aspect of sheaf theory, concerned with sheaves of abelian groups, that applies homological algebra to make possible effective calculation of the global sections… primality-test× 100 An algorithm for determining whether an input number is prime. prime-ideals× 99 a subset of a ring that shares many important properties of a prime number in the ring of integers. (Def: http://en.m.wikipedia.org/wiki/Prime_ideal) regularity-theory-of-pdes× 99 The concept of regularity concerns the smoothness of weak solutions to partial differential equations. quantum-groups× 99 In mathematics and theoretical physics, the term quantum group denotes various kinds of noncommutative algebra with additional structure. (Def: http://en.m.wikipedia.org/wiki/Quantum_group) shape× 99 invariant-theory× 99 a branch of abstract algebra dealing with actions of groups on algebraic varieties, such as vector spaces, from the point of view of their effect on functions. (Def: http://en.m.wi… big-picture× 99 Questions to get the "big picture" about a subject. homogeneous-equation× 99 called homogeneous if the following condition is satisfied: If$\phi(x)$is a solution, so is$c \phi(x)$, where c is an arbitrary (non-zero) constant. (Def: http:… biology× 98 For questions regarding mathematical concepts with applications to Biology. polylogarithm× 98 For questions about or related to polylogarithm functions. uniform-spaces× 97 In the mathematical field of topology, a uniform space is a set with a uniform structure. (Def: http://en.m.wikipedia.org/wiki/Uniform_space) error-propagation× 96 For questions on propagation of errors. connections× 95 In mathematics, a connection on a fiber bundle is a device that defines a notion of parallel transport on the bundle; that is, a way to "connect" or identify fibers over nearby points. (Def: http://… symbolic-computation× 95 Numeric computation usually uses floating point numbers. Symbolic computations use symbols, and can give exact answers, such as$\sum_{n=1}^\infty \frac{1}{n^2} = \frac{\pi^2}{6}\$. Mathematica, Maple…