Tags
A tag is a keyword or label that categorizes your question with other, similar questions.
For questions about or related to multisets, a notion similar to sets with the difference that elements can be repeated.
357 questions
Statistical mechanics is a branch of mathematical physics that studies, using probability theory, the average behaviour of a mechanical system where the state of the system is uncertain.
356 questions
Questions on spherical harmonics, a set of basis functions that satisfy an orthogonality relation over the sphere.
354 questions
Potential theory concerns solutions of elliptic partial differential equations (especially Laplace's equation) that are represented by integration against a measure or a more general distribution.
354 questions
Quantum Computation deals with considering computation as fundamentally physical, as well as replacing the classical binary digit (bit) with the quantum binary digit (qubit). While the classical bit is either 0 or 1, the qubit can be in a superposition of these states. Computation systems that use quantum phenomena, such as superposition and entanglement, can solve certain complex problems very quickly.
352 questions
On the many different ways to turn non-linear systems of equations into linear ones.
349 questions
Recommended to be used when the Inverse function theorem is being employed in a question, and also for those users that need help understanding it.
349 questions
Use for methods for constructing generalized sums of series, generalized limits of sequences, and values of improper integrals.
348 questions
Equations that can be written in the form $p(x) = 0$ for a univariate polynomial $p$ of degree $4$ or $p(X_1, \ldots, X_r) = 0$ for a multivariate polynomial $p$ of total degree $4$. Questions that use this tag should usually also have the polynomial tag.
348 questions
348 questions
For question about Hodge theory, which is a method for studying the cohomology groups of a smooth manifold using partial differential equations.
348 questions
A Hermitian matrix is a complex square matrix that is equal to its own conjugate transpose.
348 questions
This tag is for questions relating to Singularity Theory. In singularity theory the general phenomenon of points and sets of singularities is studied, as part of the concept that manifolds (spaces without singularities) may acquire special, singular points by a number of routes.
346 questions
For questions involving the notion of the Radon-Nikodym derivative or the Radon-Nikodym theorem. Use this tag along with (probability-theory) or (measure-theory).
345 questions
Geometric algebras are Clifford algebras over the real numbers. They are applied in geometry and theoretical physics.
344 questions
For questions related to the Fubini-Tonelli theorem, a theorem for interchanging integrals.
344 questions
The study of maximal or minimal graphs satisfying certain properties.
344 questions
Poker is a card game with several variants (Draw, Texas Hold'em, ...), the common goal being to collect face value patterns such as "four of a kind", "full house" or "straight" or all of a suit ("flush") with five cards. Questions about combinatorics, probabilities, strategies (bluffing and betting).
342 questions
This tag is for questions relating to the Gaussian integer, which is a complex number $~z=~a~+i~b~$ whose real part $~a~$ and imaginary part $~b~$ are both integers.
342 questions
For questions related to Bayesian networks, the generic example of a directed probabilistic graphical model. Includes dynamic Bayesian networks, e.g. Hidden Markov Models (HMMs) and Kalman Filters. For applications of Bayesian networks in any field, e.g. machine learning. NOT for general questions about Bayes' theorem, Bayesian statistics, conditional probabilities, networks, or graph theory.
342 questions
Use this tag for questions related to the Haar measure, which is an assignment of an "invariant volume" to subsets of locally compact topological groups, consequently defining an integral for functions on those groups.
341 questions
Birthday problems typically look at probabilities and expectations of a random group of individuals sharing birthdays and how this changes as the number of people increase. They often assume that individuals' birthdays are independently uniformly distributed across 365 days but similar problems can use other numbers or assumptions. They can be generalised to wider occupancy and collision problems.
340 questions
For questions about $\theta$ functions (special functions of several complex variables).
338 questions
Use this tag for questions about the board on which the game of chess is played.
336 questions
A technique in geometry (especially algebraic and differential, and, by extension, the study of pseudo-differential operators) for resolution of singularities. Not to be confused with the formation of singularities in solutions of ordinary or partial differential equations.
336 questions
For questions about spin manifolds, the groups $\operatorname{Spin}(n)$, as well as generalisations such as $\operatorname{Pin}(n)$ and $\operatorname{Spin}^c(n)$. This tag should also be used for any questions about the geometry of spin manifolds, including questions involving Dirac operators and the Lichnerowicz formula.
334 questions
This tag is for questions relating to "Filtrations". It has many application in abstract algebra, homological algebra, topology, measure theory and probability theory for nested sequences of $\sigma$-algebras.
334 questions
Meta-theory is the term for the theory in which mathematics is formalized (often PA, ZFC or similar theories). Meta-mathematical statements are statements which are evaluated at the level of the meta-theory rather than the theory. This tag is for questions regarding meta-mathematical theories, and related topics.
333 questions
For questions on the subject of "satisfiability", that is, whether there exists an interpretation/model in which a given (logical) formula is true.
332 questions
For questions about the least common multiple of a collection of numbers (or more generally, elements of a commutative ring).
332 questions
In topology, an open map is a function between two topological spaces which maps open sets to open sets. That is, a function f : X → Y is open if for any open set U in X, the image f(U) is open in Y. A map may be open, closed, both, or neither; in particular, an open map need not be closed and vice versa.
330 questions
Clustering is grouping (partitioning) a set of objects so that items in the same group are more similar to each other than to items in different groups, where the notion of similarity may be variously defined.
328 questions