# 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:
 multinomial-coefficients× 105 For questions related to multinomial coefficients, a generalization of binomial coefficients. fractional-calculus× 105 Questions on the differentiation/integration of functions to arbitrary order. natural-deduction× 104 For questions concerning natural deduction, a formalization in proof theory, and proofs in natural deduction. sums-of-squares× 104 For questions concerning various representation of integers as sums of squares, which are studied in number theory. semidirect-product× 104 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 $N$. potential-theory× 102 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. reflection× 102 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… multisets× 102 For questions about or related to multisets, a notion similar to sets with the difference that elements can be repeated. golden-ratio× 102 Questions relating to the golden ratio $\varphi = \frac{1+\sqrt{5}}{2}$ infinite-groups× 100 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) big-picture× 99 Questions to get the "big picture" about a subject. graph-isomorphism× 99 isomorphic if they have a function $f$ which provides an exact pairing of vertices in the two graphs such that for any adjacent vertices $u,v\in \{\mbox{set of vertices of }… group-rings× 98 a ring constructed from a group$G$and ring$R$. A special case of this construction is group algebra, which occurs naturally in representation theory. finitely-generated× 97 For questions regarding finitely generated groups. If S is finite, then a group$G = \langle S\rangle$is called finitely generated. dirichlet-series× 97 For questions on Dirichlet series. invariant-theory× 97 a branch of abstract algebra dealing with actions of groups on algebraic varieties, such as vector spaces, from the point of view of their effect on functions. (Def: http://en.m.wi… uniform-spaces× 97 In the mathematical field of topology, a uniform space is a set with a uniform structure. (Def: http://en.m.wikipedia.org/wiki/Uniform_space) primality-test× 96 An algorithm for determining whether an input number is prime. spheres× 96 For geometrical problems involving spheres. Use the tag (geometry) as well. For intrinsic geometry of spheres, see (spherical-geometry). dihedral-groups× 96 For questions on dihedral groups, the group of symmetries of a regular polygon, including both rotations and reflections biology× 95 For questions regarding mathematical concepts with applications to Biology. shape× 95 polylogarithm× 95 For questions about or related to polylogarithm functions. line-integrals× 95 an integral where the function to be integrated is evaluated along a curve. The terms path integral, curve integral, and curvilinear integral are also used. monoidal-categories× 95 In mathematics, a monoidal category (or tensor category) is a category C equipped with a bifunctor ⊗ : C × C → C which is associative up to a natural isomorphism, and an object I which is both a lef… sheaf-cohomology× 94 the aspect of sheaf theory, concerned with sheaves of abelian groups, that applies homological algebra to make possible effective calculation of the global sections… homogeneous-equation× 94 called homogeneous if the following condition is satisfied: If$\phi(x)$is a solution, so is$c \phi(x)$, where c is an arbitrary (non-zero) constant. (Def: http:… hamiltonian-path× 93 A path in a graph that visits each vertex exactly once. symbolic-computation× 93 Numeric computation usually uses floating point numbers. Symbolic computations use symbols, and can give exact answers, such as$\sum_{n=1}^\infty \frac{1}{n^2} = \frac{\pi^2}{6}$. Mathematica, Maple… prime-ideals× 92 a subset of a ring that shares many important properties of a prime number in the ring of integers. (Def: http://en.m.wikipedia.org/wiki/Prime_ideal) pythagorean-triples× 91 Questions about Pythagorean triples, positive integer solutions to$a^2 + b^2 = c^2$. ordered-fields× 91 fields which have an additional structure, a linear order compatible with the field structure. This tag is for questions regarding ordered fields and their properties, as well proof… graded-rings× 91 In mathematics, in particular abstract algebra, a graded ring is a ring that is a direct sum of abelian groups$R_i$such that$R_i R_j \subset R_{i+j}\$. (Def: http://en.m.wikipedia.org/wiki/Graded_ri… additive-combinatorics× 91 about giving combinatorial estimates of addition and subtraction operations on Abelian groups or other algebraic objects. Key words: sum set estimates, inverse theorems, grap… algebras× 91 For questions about algebras, their properties, and their structures.