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× 394 
kt.ktheoryhomology× 390
Algebraic and topological Ktheory, relations with topology, commutative algebra, and operator algebras

convexpolytopes× 389
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…

vectorbundles× 389
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× 386
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× 385
a method first used to prove the continuum hypothesis is independent of the classical axioms of set theory

ergodictheory× 356
Dynamical systems on measure spaces, invariant measures, ergodic averages, mixing properties.

abelianvarieties× 354
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× 352
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× 351
Schrodinger operators, operators on manifolds, general differential operators, numerical studies, integral operators, discrete models, resonances, nonselfadjoint operators, random operators/matrices…

simplicialstuff× 342  sheaftheory× 342 
hyperbolicgeometry× 336  integration× 332  examples× 328 
terminology× 322
Questions of the kind "What's the name for a X that satisfies property Y?"

groupcohomology× 321  galoistheory× 320 
openproblem× 320
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…

lattices× 319
used in number theory. (Not to be confused with lattice theory or lattices as used in physics!)

convexgeometry× 312 
geometricgrouptheory× 305
Large scale properties of groups; growth functions; Dehn functions; small cancellation properties; hyperbolicity and CAT(0); actions and representations; combinatorial group theory; presentations

specialfunctions× 302
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.

diophantineequations× 293 
convexity× 288  sobolevspaces× 286  modelcategories× 283  riemannsurfaces× 282 
deformationtheory× 278  automorphicforms× 271 
it.informationtheory× 267
Covers theoretical and experimental aspects of information theory and coding.

stochasticcalculus× 267
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.

cstaralgebras× 266
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…

ordertheory× 262  stacks× 259  largecardinals× 258 