Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange


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.

× 3902
For questions about the expectation of a random variable: computations, upper/lower bounds, etc.
× 3868
Questions related to understanding line integrals, vector fields, surface integrals, the theorems of Gauss, Green and Stokes. Some related tags are (multivariable-calculus) and (differential-geometry)…
× 3838
For questions about properties and applications of triangles.
× 3802
All mathematical questions about computer science, including theoretical computer science, formal methods, verification, and artificial intelligence. For questions about Turing computability, please u…
× 3798
For questions concerning circles. A circle is the locus of points in a plane that are at a fixed distance from a fixed point.
× 3785
For questions about Lie algebras, an algebraic structure whose main use is in studying geometric objects such as Lie groups and differentiable manifolds.
× 3755
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…
× 3709
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…
× 3660
Questions on the mathematics required to solve problems in physics. For questions from the field of mathematical physics use (mathematical-physics) tags instead.
× 3658
Use for questions about finding integer or rational solutions to polynomial equations.
× 3614
a decomposition of a periodic function as a linear combination of sines and cosines, or complex exponentials.
× 3463
Question about finding the primitives of a given function, whether or not elementary.
× 3396
fields (number systems with addition, subtraction, multiplication, and division) with only finitely many elements. They arise in abstract algebra, number theory, and cryptography. T…
× 3359
Stochastic processes (with either discrete or continuous time dependence) on a discrete (finite or countably infinite) state space in which the distribution of the next state depends only on the curre…
× 3307
great ways to learn about the intricacies of definitions in mathematics. Counterexamples are especially useful in topology and analysis where most things are fairly in…
× 3303
Questions on special functions, useful functions that frequently appear in pure and applied mathematics (usually not including "elementary" functions).
× 3302
For questions about or related to Sobolev spaces, which are function spaces equipped with a norm combining norms of a function and its derivatives.
× 3293
Questions regarding the plotting or graphing of functions. Questions about graphs with vertices and edges should use the (graph-theory) tag instead.
× 3288
Appropriate for questions about truth tables, conjunctive and disjunctive normal forms, negation, and implication of unquantified propositions. Also for general questions about the propositional calcu…
× 3240
Questions about quadratic functions and equations, second degree polynomials usually in the forms $y=ax^2+bx+c$, $y=a(x-b)^2+c$ or $y=a(x+b)(x+c)$.
× 3183
Puzzles, curiosities, brain teasers and other mathematics done "just for fun".
× 3134
intended for questions concerning partial orders, equivalence relations, properties of relations (transitive, symmetric…), composition of relations and similar stuff. More-or-less the thin…
× 3058
The process of studying mathematics without formal instruction. Don't use this tag just because you were self-studying when you came across the mathematical question you're asking; it is only for when…
× 3052
A vector space $E$, generally over the field $\mathbb R$ or $\mathbb C$ with a map $\lVert \cdot\rVert\colon E\to \mathbb R_+$ satisfying some conditions.
× 3029
For questions about $L^p$ spaces, that is, given a measure space $(X,\mathcal F,\mu)$, the vector space of equivalence class of measurable functions with $p$-th power of the absolute value integrable.…
× 3027
if your question involves some type of (co)homology, including (but not limited to) simplicial, singular or group (co)homology. Consider the tag (homological-algebra) for more abstract as…
× 3018
Questions on linear programming, the optimization of a linear function subject to linear constraints.
× 3017
a branch of mathematics that operates on stochastic processes. It allows a consistent theory of integration to be defined for integrals of stochastic processes with respect to s…
× 2985
for questions about extension fields in abstract algebra. An extension field of a field K is just a field containing K as subfield, but interesting questions arise with them. Use this…
× 2916
Questions about exponentiation, the operation of raising a base $b$ to an exponent $a$ to give $b^a$.
× 2903
Inverses include: multiplicative inverse of a number (reciprocal), inverse function, matrix inverse, etc. A subject tag such as (linear-algebra), (algebra-precalculus) or (arithmetic) should be added…
× 2894
Homological algebra studies homology and cohomology groups in a general algebraic setting, that of chains of vector spaces or modules with composable maps which compose to zero. These groups furnish u…
× 2807
Questions on conic sections and their properties; the curves formed by the intersection of a plane and a cone. Circles, ellipses, hyperbolas, and parabolas are examples of conic sections.
× 2780
For questions that involve concrete approximations, such as finding an approximate value of a number with some precision. For questions that belong to the mathematical area of Approximation Theory, us…
× 2745
a vector space equipped with an inner product. The inner product is a generalization of the “dot” product often used in vector calculus.
× 2724
a widely used integral transform (transformation of functions by integrals), similar to the Fourier transform.