Tags
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 manifold is a topological space that locally resembles Euclidean space near each point. More precisely, each point of an n-dimensional manifold has a neighbourhood that is homeomorphic to the Euclid…
567 questions
Markov chains are stochastic processes for which the probability of attaining a given state at a given time depends only on the previous state attained and thus can be described by a transition probab…
566 questions
Algebraic and geometric theory of quadratic forms and symmetric bilinear forms, e.g., values attained by quadratic forms, isotropic subspaces, the Witt ring, invariants of quadratic forms, the discrim…
564 questions
For questions requesting examples of a certain structure or phenomenon
558 questions
Elliptic, parabolic and hyperbolic operators. Laplace, Laplace-Beltrami, Schrödinger, Dirac. Exterior derivative and Lie derivative operators.
554 questions
Questions about Kähler manifolds and Kähler metrics.
548 questions
Combinatorial properties of infinite sets. This is a corner-point of set theory and combinatorics.
547 questions
546 questions
Euclidean geometry is a mathematical system attributed to the Alexandrian Greek mathematician Euclid, which he described in his textbook on geometry: the Elements. Euclid's method consists in assuming…
539 questions
Non-commutative rings and algebras, non-associative algebras. Can be used in combination with ra.rings-and-algebras
537 questions
535 questions
Questions about partial differential equations of parabolic type. Often used in combination with the top-level tag ap.analysis-of-pdes.
531 questions
Questions about the determinant of square matrices or linear endomorphisms. Also for closely related topics such as minors or regularized determinants.
526 questions
522 questions
522 questions
In mathematics a stack or 2-sheaf is a sheaf that takes values in categories rather than sets.
521 questions
Plane Geometry is about flat shapes like lines, circles and triangles , shapes that can be drawn on a piece of paper
520 questions
Using computers to solve geometric problems. Questions with this tag should typically have at least one other tag indicating what sort of geometry is involved, such as ag.algebraic-geometry or mg.metr…
515 questions
A group action is a group homomorphism between a given group $G$ and the group of bijective maps from a set $X$ to itself.
510 questions
Linear programming is the study of optimizing a linear function over a set of linear inequalities. The Simplex Method, Ellipsoid Method and Interior Point Method are popular algorithms to solve linea…
492 questions
The theory of lattices in the sense of order theory. For the number-theoretic notion, use the tag "lattices" instead.
488 questions
Noncommutative geometry in the sense of Connes and beyond: noncommutative algebras viewed as functions on a noncommutative space.
487 questions
Computational Number Theory is for explicit calculations or algorithms involving anything of interest to number theorists.
484 questions
The study of harmonic differential forms on complex projective varieties, their invariantly defined filtrations, their integrals over topological cycles, especially over subvarieties, the deformations…
480 questions
An algebraic surface is an algebraic variety of dimension two. In the case of geometry over the field of complex numbers, an algebraic surface has complex dimension two (as a complex manifold, when it…
479 questions
Combinatorial optimization typically deals with optimizing over a finite set of objects that have some combinatorial structure (e.g. trees, matchings, matroids). Approximation algorithms, polyhedral …
473 questions
Matrix theory is the study of matrices as concrete objects, rather than as abstract linear operators between vector spaces (whose study belongs to linear algebra). For instance, this involves matrix f…
472 questions
The symmetric group $S_n$ is the group of permutations of the set of integers $\{1,\dots,n\}$. This has $n!$ elements and is generated by the $n-1$ involutions exchanging consecutive integers. The sym…
471 questions
for questions about motives in algebraic geometry, including constructions of categories of motives and motivic sheaves, and aspects of the standard conjectures.
465 questions
Questions about generalizations of the Riemann Zeta function of arithmetic interest whose definition relies on meromorphic continuation of special kinds of Dirichlet series, such as Dirichlet L-functi…
464 questions
A metric space is a pair $(X,d)$, where $X$ is a set and $d:X \times X \to \mathbb{R}$ satisfies the following conditions for all $x,y,z \in X$. (Symmetry) $d(x,y)=d(y,x)$. (Identity of Indiscernibl…
463 questions
For questions that explicitly reference the binomial coefficients, Pascal's Triangle, and Binomial identities.
460 questions
A reductive group is an algebraic group $G$ over an algebraically closed field such that the unipotent radical of $G$ is trivial
458 questions
The study of algebraic structures and properties applying to large classes of such structures. For example, ideas from group theory and ring theory are extended and considered for structures with oth…
456 questions
440 questions