# 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:
 combinatorial-designs× 57 For questions about Combinatorial design theory, a part of combinatorial mathematics that deals with the existence, construction and properties of systems of finite sets whose arrangements satisfy gen… idempotents× 57 For questions about elements which satisfy $x\cdot x=x$ where $\cdot$ is a composition law. hopf-algebras× 56 For questions about Hopf algebras and related concepts, such as quantum groups. collatz× 56 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… cw-complexes× 56 means× 56 rigid-transformation× 56 mappings from one reference frame to another reference frame in the Euclidean space $\mathbb R^n$. They comprise translation, rotation (and sometimes reflection). More for… primitive-roots× 55 For questions about primitive roots in modular arithmetic, index calculus, and applications in cryptography. For questions about primitive roots of unity, use the (roots-of-unity) tag instead. mathematicians× 54 Questions about mathematicians and their lives. model-categories× 54 categories with three distinguished classes of morphisms: the weak equivalences, the fibrations and the cofibrations. They provide a natural setting for [tag:homotopy-theory] in a… separation-axioms× 54 properties of topological space which, roughly speaking, say in what way two points, a point and a closed set, or two closed sets can be "separated". complex-dynamics× 54 the study of dynamical systems of functions over complex numbers. utility× 54 A tag for all questions involving a type of utility function. translation-request× 53 for requests to translate written mathematical material from one language to another. bifurcation× 53 hodge-theory× 53 The study of relations between, one the one hand, the topology of a smooth manifold as encoded in the cohomology groups, and on the other, the set of solutions to the Laplace operator on differential … invariance× 53 finite-element-method× 53 A method of obtaining (numerically) approximate solutions to (usually) differential equations. It consists of a method of discretization splitting the domain into disjoint subdomains over each of whic… faq× 53 meant for questions which are generalized forms of questions which get asked frequently. See tag details for more information. rubiks-cube× 53 Questions on the mathematics behind the famed toy invented by Ernő Rubik. noise× 52 artificial-intelligence× 52 For questions about artificial intelligence. nets× 51 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. … minimal-surfaces× 51 Question on minimal surfaces, or surfaces that have zero mean curvature. random-functions× 51 mean-square-error× 50 multiplicative-function× 49 In number theory, a multiplicative function is a function defined on positive integers such that f(ab)=f(a)f(b) for a,b coprime. E.g. Euler's totient function, sum of divisors and number of divisor… automorphic-forms× 49 experimental-mathematics× 49 The utilization of advanced computing technology in mathematical research: new mathematical results discovered partly or entirely with the aid of computer-based tools. coherent-sheaves× 48 compact-manifolds× 48 For questions regarding the structure and properties of compact manifolds. dedekind-domain× 48 quadrilateral× 48 For questions about general quadrilaterals (including parallelograms, trapezoids, rhombi) and their properties. dimensional-analysis× 47 formal-proofs× 47 For questions about proofs within a formal system, such as natural deduction or Hilbert system. grassmannian× 47