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.

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The study of geometry of manifolds without appealing to differential calculus. It includes studies of length spaces, Alexandrov spaces, and CAT(k) spaces. The techniques are often applicable to Rieman…
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The difference of two prime consecutive prime numbers is the prime gap. $g_i := p_{i+1} - p_i$.
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Questions on quadratic variations of stochastic processes. (Not to be confused with functions of bounded variation.)
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For questions about the structure of product space, in the context of topology or measure theory for example. Use other tags to indicate the context.
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For questions pertaining to power towers: expressions like a^(b^(c^d))), which result from iterated exponentiation. The "hyperoperation" tag may be appropriate, too.
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the study of invariants of large matrices, in a suitable sense. It has many variations: (algebraic-k-theory), (topological-k-theory), or in the study of (operator-algebras).
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The study of how mathematical objects (complex manifolds, associative algebras, Lie algebras) can be deformed into similar mathematical objects, at least infinitesimally.
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for questions about combinatorial and computational issues with regards to calendar systems. A typical, well-known mathematical result in this direction is John Conway's Doomsday Algorithm…
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graphs obtained from a group $G$ in a such way that vertices are elements of the group and edges are added using some generating set $S\subseteq G$.
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a form of many-valued logic that deals with approximate, rather than fixed and exact reasoning. (Def: http://en.m.wikipedia.org/wiki/Fuzzy_logic)
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a group $G$ whose elements are invertible $n \times n$ matrices over a field $F$.
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For questions on determining whether a number is rational, and related problems. If applicable, use this tag instead of (rational-numbers) and (irrational-numbers). Consider adding a tag (radicals) or…
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Questions about vector spaces equipped with a symplectic form, a non-degenerate, skew-symmetric bilinear form.
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For questions about the least common multiple of a collection of numbers (or more generally, elements of a commutative ring).
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an arrangement of $n^2$ numbers, usually distinct integers, in a square, such that the n numbers in all rows, all columns, and both diagonals sum to the same constant. ht…
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Question on bits and pieces of mathematics that show up in popular media (TV, movies, comics, etc.)
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For questions about Goldbach's conjecture: every even integer greater than two is the sum of two primes.
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Questions related to mathematical chemistry which include application of mathematics to problems in chemistry and the development of mathematical methods suitable for such applications and for the for…
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If the expression obtained after any substitution during limit analysis does not give enough information to determine the original limit, it is known as an indeterminate form.
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For questions about various search algorithms.
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For questions concerning the open source computational software program Maxima.
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Questions about or involving perfect numbers which are positive integers that are equal to the sum of their proper positive divisors.
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an oriented graph which might contain multiple edges and loops. The terminology is used in representation-theory of finite dimensional algebras, where one considers functors from this grap…
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a particular form of optimization modeling that tends to be well-suited for combinatorial models like scheduling and planning.
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For questions about vector lattices (aka. Riesz spaces; a type of vector space equipped with a partial order), Banach lattices and similar topics.
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For questions regarding the mathematical analysis of voting systems and behavior. Examples include the median voter theorem or the Condorcet jury theorems.
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Computation of Cauchy principal values of integrals. May be tied in with contour integration, but should be separate from definite-integrals.
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