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:
× 2351
Representation theory studies (among else) representations of groups by finite matrices. The non-commutative analog of classical Fourier transforms.
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Questions on basic arithmetic, e.g. addition, subtraction, multiplication, division, powers, radicals, etc.
× 2326
Questions involving asymptotic analysis, including growth of functions, Big-O notation, Big-Omega and Big-Theta notations.
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Questions related to the algebraic structure of algebraic integers
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For questions on manifolds of dimension $n$, a topological space that near each point resembles $n$-dimensional Euclidean space.
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Questions about maps from a probability space to a measure space which are measurable.
× 2032
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 …
× 2030
All mathematical questions about computer science, including theoretical computer science, formal methods, verification, and artificial intelligence. For questions about Turing computability, please u…
× 1945
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, …
× 1917
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.
× 1917
Coefficients involved in the Binomial Theorem. $\binom{n}{k}$ counts the subsets of size $k$ of a set of size $n$.
× 1916
For question involving Hilbert spaces, that is, complete normed spaces whose norm comes from an inner product.
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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…
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Questions about the process of studying mathematics without formal instruction.
× 1800
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…
× 1798
For requesting, clarifying, and comparing definitions of mathematical terms.
× 1781
a complete normed vector space: A vector space equipped with a norm such that every Cauchy sequence converges.
× 1740
Questions on special functions, useful functions that frequently appear in pure and applied mathematics (usually not including "elementary" functions).
× 1645
Problems from or inspired by mathematics competitions. Questions regarding mathematics competitions.
× 1642
for questions about divisibility, that is, determining when one thing is a multiple of another thing.
× 1634
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.
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Questions on finding integer/rational solutions of polynomial equations.
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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…
× 1521
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…
× 1472
For question involving exponential functions and questions on exponential growth or decay.
× 1467
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…
× 1466
Questions on the Gaussian, or normal probability distribution, which may include multi-dimensional normal distribution.
× 1464
a subset of ring such that it is possible to make a quotient ring with respect to this subset. This is the most frequent use of the name ideal, but it is used in other areas of mathemat…
× 1448
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.
× 1424
Puzzles, curiosities, brain teasers and other mathematics done "just for fun".
× 1411
For questions about Lie algebras, an algebraic structure whose main use is in studying geometric objects such as Lie groups and differentiable manifolds.
× 1409
For question about integration, where the theory is based on measures. So it's almost always used together with the tag [measure-theory], and its aim is to specify questions about integral, not only p…
× 1394
intended for questions concerning partial orders, equivalence relations, properties of relations (transitive, symmetric,...), composition of relations and similar stuff. More-or-less the t…
× 1390
Question about determinants, computation or theory. If $E$ is a vector space of dimension $d$, then we can compute the determinant of a $d$-uple $(v_1,\ldots,v_d)$ with respect to a basis.
× 1387
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…
× 1383
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…