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:
× 1894
For questions related to permutations, which can be viewed as re-ordering a collection of objects.
× 1869
the branch of functional analysis that focuses on bounded linear operators, but it includes closed operators and nonlinear operators. Operator theory is also concerned with the stu…
× 1854
Questions regarding functions defined recursively, such as the Fibonacci sequence.
× 1750
Questions related to the algebraic structure of algebraic integers
× 1726
For questions on manifolds of dimension $n$, a topological space that near each point resembles $n$-dimensional Euclidean space.
× 1655
All mathematical questions about computer science, including theoretical computer science, formal methods, verification, and artificial intelligence. For questions about Turing computability, please u…
× 1607
Galois theory allows one to reduce certain problems in field theory, especially those related to field extensions, to problems in group theory. For questions about field theory and not Galois theory, …
× 1602
Questions about the properties of functions of the form $\sum_{n=0}^{\infty}a_n x^n$, where the $a_n$ are real or complex numbers, and $x$ is real or complex (or more generally an element of a Banach …
× 1587
Coefficients involved in the Binomial Theorem. $\binom{n}{k}$ counts the subsets of size $k$ of a set of size $n$.
× 1561
Questions about maps from a probability space to a measure space which are measurable.
× 1554
Questions on special functions, useful functions that frequently appear in pure and applied mathematics (usually not including "elementary" functions).
× 1531
the study of properties of convex sets and convex functions. For questions about optimization of convex functions over convex sets, please use the (convex-optimization) tag.
× 1530
For question involving Hilbert spaces, that is, complete normed spaces whose norm comes from an inner product.
× 1530
Questions about studying mathematics without formal instruction.
× 1521
the field dealing with differentiable functions on differentiable manifolds. It is closely related to differential geometry and together they make up the geometric theory of d…
× 1472
Questions involving improper integrals, defined as the limit of a definite integral as an endpoint of the interval of integration approaches either a specified real number or ∞ or −∞, or as both endpo…
× 1462
a complete normed vector space: A vector space equipped with a norm such that every Cauchy sequence converges.
× 1441
the core of mathematical precision; they come to answer "what is X" in mathematics. Into this category fit questions regarding equivalence of definitions; clarifications regarding comp…
× 1311
Questions related to mathematical physics which include application of mathematics to problems in physics and the development of mathematical methods suitable for such applications and for the formula…
× 1265
the instinctive impression regarding mathematical ideas which originate naturally without regard to formal mathematical proofs. It may or may not stem from a cognitive ration…
× 1261
Questions regarding the Taylor series expansion of univariate and multivariate functions, including coefficients and bounds on remainders. A special case is also known as the Maclaurin series.
× 1256
Questions on finding integer/rational solutions of polynomial equations.
× 1243
a group (in the sense of abstract algebra) that is also a differentiable manifold, such that the group operations (addition and inversion) are smooth, and so we can study them with diff…
× 1239
Problems from or inspired by mathematics competitions. Questions regarding mathematics competitions.
× 1234
In dynamical systems, the motion of a particle in some geometric space, governed by some time dependent rules, is studied. The process can be discrete (where the particle jumps from point to point) or…
× 1230
Puzzles, curiosities, brain teasers and other mathematics done "just for fun".
× 1200
for questions about divisibility, that is, determining when one thing is a multiple of another thing.
× 1199
Questions on the Gaussian, or normal probability distribution, which may include multi-dimensional normal distribution.
× 1176
geometry assuming the parallel postulate of Euclid: in a plane, given a line and a point not on that line, there is exactly one line parallel to the given line through the given point.
× 1159
Questions on Fourier series, the expansion of a function in terms of basis functions that satisfy an orthogonality relation. Usually, complex exponentials/sines and cosines are used.
× 1141
For questions about Lie algebras, an algebraic structure whose main use is in studying geometric objects such as Lie groups and differentiable manifolds.
× 1136
is for questions about compactness and its many variants (e.g. sequential compactness, countable compactness) as well locally compact spaces; compactifications (e.g. one-point, Sto…
× 1128
Questions regarding the plotting or graphing of functions. Questions about graphs with vertices and edges should use the (graph-theory) tag instead. (STUB)
× 1114
Questions on the circle, a curve composed of points that are at a fixed distance from a fixed point.
× 1104
intended for questions concerning partial orders, equivalence relations, properties of relations (transitive, symmetric,...), composition of relations and similar stuff. More-or-less the t…
× 1100
For question involving exponential functions and questions on exponential growth or decay.