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: 
sequencesandseries× 388 
kt.ktheoryhomology× 384
Algebraic and topological Ktheory, relations with topology, commutative algebra, and operator algebras

vectorbundles× 383
A continuously varying family of vector spaces of the same dimension over a topological space. If the vector spaces are onedimensional, the term line bundle is used and has the associated tag linebu…

computabilitytheory× 378
computable sets and functions, Turing degrees, c.e. degrees, models of computability, primitive recursion, oracle computation, models of computability, decision problems, undecidability, Turing jump, …

forcing× 377
a method first used to prove the continuum hypothesis is independent of the classical axioms of set theory

convexpolytopes× 374
the convex hulls of a finite set of points in Euclidean spaces. They have rich combinatorial, arithmetic, and metrical theory, and are related to toric varieties and to linear pr…

abelianvarieties× 352
projective algebraic varieties endowed with an Abelian group structure. Over the complex numbers, they can be described as quotients of a vector space by a lattice of full rank. …

computerscience× 347
For question borderline with, or having application to, computer science. Consider also posting http://cs.stackexchange.com/ or http://cstheory.stackexchange.com/ instead of here, if appropriate.

ergodictheory× 347
Dynamical systems on measure spaces, invariant measures, ergodic averages, mixing properties.

sp.spectraltheory× 344
Schrodinger operators, operators on manifolds, general differential operators, numerical studies, integral operators, discrete models, resonances, nonselfadjoint operators, random operators/matrices…

simplicialstuff× 339  sheaftheory× 337 
hyperbolicgeometry× 335  integration× 321  examples× 320 
lattices× 318
used in number theory. (Not to be confused with lattice theory or lattices as used in physics!)

groupcohomology× 317 
openproblem× 316
equivalent to a known open problem, then the openproblem tag is added. After that, the question essentially becomes, "What is known about this problem? What are some…

terminology× 314  galoistheory× 313 
convexgeometry× 306 
specialfunctions× 300
Many special functions appear as solutions of differential equations or integrals of elementary functions. Most special functions have relationships with representation theory of Lie groups.

geometricgrouptheory× 293
Large scale properties of groups; growth functions; Dehn functions; small cancellation properties; hyperbolicity and CAT(0); actions and representations; combinatorial group theory; presentations

diophantineequations× 286 
convexity× 284  riemannsurfaces× 281  modelcategories× 277  deformationtheory× 274 
sobolevspaces× 272  automorphicforms× 270 
stochasticcalculus× 266
Stochastic calculus provides a consistent theory of integration for stochastic processes and is used to model random systems. Its applications range from statistical physics to quantitative finance.

it.informationtheory× 264
Covers theoretical and experimental aspects of information theory and coding.

cstaralgebras× 261
a complex Banach algebra together with an isometric antilinear involution satisfying (a b)* = b* a* and the C*identity ‖a* a‖ = ‖a‖². Related tags: [tag:banachalgebras], [tag:vonne…

stacks× 259  largecardinals× 257 
schemes× 250
the geometrical study of solutions of algebraic systems of equations, not only over the real/complex numbers, but also over integer numbers (and more generally o…
