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.

Everything the deals with properties and definitions of Haar measure, as well as related fields when the question relies heavily on the notion of haar measure - group harmonic analysis, group ergodic …
113 questions
(Usually one-parameter) semigroups of linear operators and its applications to partial differential equations, stochastic processes such as Markov processes and other branches of mathematics.
113 questions
Stability theory, including global stability (in dynamical systems, where it can notably be used in combination with ds.dynamical-systems)
112 questions
one of a few general methods enabling us to solve a wide range of miscellaneous problems from the theory of numbers and its applications. The strongest results hav…
111 questions
For questions about projective modules over a ring and projective objects in related categories.
111 questions
a subgroup generated by reflections through the hyperplanes orthogonal to the roots.
111 questions
For questions about matchings in graph theory. A matching on a graph is a set of edges such that no two edges share a common vertex.
110 questions
a theorem that describes the distribution of the primes. It says that the number of primes less than or equal to a real number $x$ is asymptotic to $\frac{x}{\ln x}$.
109 questions
Algebraic methods in Graph Theory; the linear algebra method, graph homomorphisms, group theoretic methods (for example Cayley graphs), and graph invariants. For graph eigenvalue problems use the spe…
109 questions
Recreational mathematics or puzzles with serious mathematical content. Note that math contest problems are generally considered off-topic.
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