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: 
axiomofchoice× 222 
schemes× 220
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…

cstaralgebras× 219
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…

largecardinals× 215 
topologicalgroups× 212  singularitytheory× 211  asymptotics× 211  3manifolds× 211 
fields× 210  abstractalgebra× 209  finitefields× 208  ordertheory× 206 
mathematicseducation× 206
For questions in Mathematics Education as a scientific discipline. For more handson questions on teaching Mathematics, please use the tag teaching. There is also a Stack Exchange community http://mat…

quadraticforms× 205 
quantumgroups× 203
Questions about algebraic structures known as quantum groups, and their categories of representations. Quasitriangular Hopf algebras and their Drinfel'd twists, triangular Hopf algebras, $C^\star$ qua…

topostheory× 202 
intuition× 199
Questions asking for the intuition behind some definition, conjecture, proof etc. In other words, questions designed to improve or to acquire understanding on a conceptual or intuitive level, as oppos…

linearprogramming× 197  noncommutativealgebra× 197 
noncommutativegeometry× 196
Noncommutative geometry in the sense of Connes and beyond: noncommutative algebras viewed as functions on a noncommutative space.

combinatorialgeometry× 196 
randommatrices× 195
Statistics of spectral properties of matrixvalued random variables.

vonneumannalgebras× 195 
hopfalgebras× 194
a vector space $H$ over a field $k$ endowed with an associative product $\times:H\otimes_k H\to H$ and a coassociative coproduct $\Delta:H\to H\otimes_k H$ which is a morphism of alg…

derivedcategory× 192
For questions about the derived categories of various abelian categories and questions regarding the derived category construction itself.

modules× 189  algebraicktheory× 187  sobolevspaces× 185 
additivecombinatorics× 181
Questions on the subject additive combinatorics, also known as arithmetic combinatorics, such as questions on: additive bases, sum sets, inverse sum set theorems, sets with small doubling, Sidon sets,…

characteristicp× 179  markovchains× 178 
operatortheory× 177
Spectrum, resolvent, numerical range, functional calculus, operator semigroups. Special classes of operators: compact, Fredholm, dissipative, differential, integral, pseudodifferential, etc.

ellipticpde× 176
Questions about partial differential equations of elliptic type. Often used in combination with the toplevel tag ap.analysisofpdes.

motives× 174  hodgetheory× 174 
teaching× 174
For questions related to teaching mathematics. For questions in Mathematics Education as a scientific discipline there is also the tag mathematicseducation.
