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.
a quantity that expresses the extent of a two-dimensional or three-dimensional surface or shape.
structures which behave similar to a power set with complement, intersection and union. Use this tag for questions about Boolean algebras as structures, or about functions defined…
For every question related to the concept of conditional expectation of a random variable with respect to a $\sigma$-algebra. It should be used with the tag (probability-theory) or (probability), and …
for questions about recommendation of books for some particular area, topic, problem. Use this tag together with (reference-request) tag.
about doing calculus, especially derivative and infinite series over spaces of vectors and matrices.
for questions about distributions (or generalized functions). For questions about "probability distributions", use (probability-distributions). For questions about distributions as sub-bu…
Questions on polar coordinates, a coordinate system where points are represented by their distance from the origin ($r$) and the angle the line joining the point and the origin makes with the positive…
for questions concerning history of mathematics, historical primacies of results, and evolution of terminology, symbols, and notations. Consider if History of Science and Mathematics Stac…
primarily C*-algebras and von Neumann algebras, and associated topics. It also includes more general algebras of operators on Hilbert space, and may include algebr…
For questions about differential forms, a class of objects in differential geometry and multivariable calculus that can be integrated.
Often called prime polynomials. Polynomials that have no polynomial divisors.
For simultaneously reflexive, symmetric and transitive relations. Use it with the tag (relations).
For questions about tensor, tensor computation and specific tensors (e.g.curvature tensor, stress tensor).
For questions related to volume, the amount of space that a substance or object occupies.
a two-dimensional submanifold of three-dimensional Euclidean space.
For questions about or involving the absolute value function.
for questions about *rotations*: a type of rigid motion in a space.
the study of complex manifolds and complex algebraic varieties. It is a part of both differential geometry and algebraic geometry. For elementary questions about geometry in the c…
If you already have a proof for some result but want to ask for a different proof (using different methods).
for question on connected spaces and various related notions (connected components, locally connected spaces, pathwise/arcwise connected spaces, simply connected spaces, totally disconnec…
A non-linear optimization problem includes an objective function (to be minimized or maximized) and some number of equality and/or inequality constraints where the objective or some of the constraints…
For question about discrete or continuous (super/sub)martingales. Often used with [probability-theory] tag.
The evaluation of limits without the usage of L'Hôpital's rule.
Questions on (linear or nonlinear) regression, the fitting of functions that best approximate empirical data.
Optimization of functionals mostly defined on infinite-dimensional spaces.
Questions on the (continuous or discrete) convolution of two functions. It can also be used for questions about convolution of distributions (in the Schwartz's sense) or measures.
the study of generalized notions of eigenvalues and eigenvectors for linear operators in Banach spaces.
For questions regarding elliptic curves. Questions on ellipses should be tagged [conic-sections] instead.
Questions on the gamma function $\Gamma(z)$ of Euler extending the usual factorial $n!$ for arbitrary argument, and related functions.
For questions about parametric equations, their application, equivalence to other equation types and definition.
For questions about congruences in modular arithmetic, concerning for example the chinese remainder theorem, Fermat's little theorem or Euler's totient theorem.
Questions having to do with financial mathematics. This is not a tag about financing, which is not within the scope of mathematics defined by the help center: http://math.stackexchange.com/help/on-top…
A Sheaf $\mathcal F$ on a topological space $X$ captures local data $\mathcal F(U)$ given on open sets $U\subseteq X$ and how such data can be restricted to smaller open sets or glued together. In typ…
the generalisation of Fourier analysis. Use this tag for analysis on locally compact groups (e.g. Pontryagin duality), eigenvalues of the Laplacian on compact manifolds or graphs,…