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: 
inequalities× 380  sequencesandseries× 380 
vectorbundles× 378
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× 374
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× 370
a method first used to prove the continuum hypothesis is independent of the classical axioms of set theory

convexpolytopes× 369
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× 353
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× 343
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.

sp.spectraltheory× 340
Schrodinger operators, operators on manifolds, general differential operators, numerical studies, integral operators, discrete models, resonances, nonselfadjoint operators, random operators/matrices…

sheaftheory× 337 
ergodictheory× 337
Dynamical systems on measure spaces, invariant measures, ergodic averages, mixing properties.

simplicialstuff× 334 
hyperbolicgeometry× 332  integration× 322  examples× 317 
lattices× 316
used in number theory. (Not to be confused with lattice theory or lattices as used in physics!)

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…

groupcohomology× 313  galoistheory× 311  terminology× 309 
convexgeometry× 301 
specialfunctions× 295
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× 287
Large scale properties of groups; growth functions; Dehn functions; small cancellation properties; hyperbolicity and CAT(0); actions and representations; combinatorial group theory; presentations

convexity× 283 
diophantineequations× 282  riemannsurfaces× 277  modelcategories× 276  deformationtheory× 268 
automorphicforms× 264 
it.informationtheory× 263
Covers theoretical and experimental aspects of information theory and coding.

cstaralgebras× 259
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…

stochasticcalculus× 259
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.

stacks× 256  sobolevspaces× 254  largecardinals× 250  etalecohomology× 249 