Tags
A tag is a keyword or label that categorizes your question with other, similar questions.
For questions related to epimorphisms, which are categorical generalizations of surjective functions.
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For questions related to Smith normal form. It is a normal form that can be defined for any matrix (not necessarily square) with entries in a principal ideal domain (PID).
111 questions
This tag is for those who are trying to prove or derive reduction formulas of integrals. Reduction formulas are often useful to those trying to integrate trigonometric, exponential, or rational functions raised to certain powers, or functions containing multiple variables.
111 questions
Kolmogorov complexity concerns the size of the shortest program that generates a given string.
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The failure of "parallel transport around a closed loop" to be the identity map. Studied in differential geometry, it is intimately tied with curvature.
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For questions concerning finite precision arithmetic in computers and other related concepts.
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A sequence $(x_n)$ in a normed space $X$ is said to be strongly convergent if there is an $x\in X$ such that $\lim_{n\rightarrow \infty } \| x_n - x\| =0 $
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Operads are structures encoding the properties of algebras (in a very general sense), for example associativity, commutativity, unitality, and the relations between them. Their main uses lie in (abstract-algebra), (category-theory) or (algebraic-topology).
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In mathematics, especially in geometry and group theory, a lattice in $\mathbb{R}^n$ is a subgroup of $\mathbb{R}^n$ which is isomorphic to $\mathbb{Z}^n$, and which spans the real vector space $\mathbb{R}^n$. In other words, for any basis of $\mathbb{R}^n$, the subgroup of all linear combinations with integer coefficients forms a lattice. A lattice may be viewed as a regular tiling of a space by a primitive cell.
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110 questions
Questions on the algebraic operation of completing the square. Should probably be used with the (algebra-precalculus) tag.
110 questions
Should be used with the (group-theory) tag. For questions about braid groups: groups which arise as fundamental groups of configuration spaces and formalize the study of the everyday notion of a braid.
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For questions on groups and rings of adeles, self-dual topological rings built on an algebraic number field.
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For questions on finding or constructing a partition of an interval to compute the Riemann integral or Riemann-Stieltjes integral.
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Questions on the Lucas numbers, a special sequence of integers that satisfy the recurrence $L_n=L_{n-1}+L_{n-2}$ with the initial conditions $L_0=2$ and $L_1=1$.
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Use this tag for questions related to amenable groups, which are locally compact topological groups carrying a kind of averaging operation on bounded functions that is invariant under translation by group elements.
109 questions
For questions regarding sumsets such as $A+B$, the set of all sums of one element from $A$ and the other from $B$.
108 questions
Infinite games. Combinatorial game theory for infinite two-player games of perfect information. Infinitary aspects of common recreational games. Open games, clopen games. Determinacy. Transfinite game values. Topological games.
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108 questions
In group theory, a method to build a new group out of two existing groups that is based upon the idea of a semi-direct product.
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For questions involving Polish spaces, that is, separable and completely metrizable topological spaces.
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This tag is for questions concerning point processes such as poisson point processes or any other point process.
107 questions
For mathematical questions about Octave; questions purely about the language, syntax, or runtime errors would likely be better received on Stack Overflow. Octave is a high-level interpreted language for numerical computations. Use either the (octave) tag or the (matlab) tag, unless your question involves both packages.
107 questions
Use this tag for questions about encoding information using fewer bits than the original representation.
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For questions about topological graphs, flows, representation, planar, and book embeddings, geometric graphs, crossing numbers, coloring graphs, and other topics in topological graph theory.
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106 questions
For questions involving matrices of infinite size, often identified with bounded linear operators on infinite-dimensional separable Hilbert spaces.
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105 questions
Use this tag for questions involving dual cones. In convex analysis, the "dual cone" to a set is the collection of all elements that form a "positive angle" with every element in the set. That is, given a set $S$ in a vector space $V$, we define the dual cone by $S^* = \{y:\langle x,y \rangle \geq 0 \text{ for all } x \in S\}$ (the precise meaning of $\langle \cdot,\cdot\rangle$ depends on the context).
105 questions
Use this tag for questions about the proof technique that allows one to compare two unrelated random variables (distributions) X and Y by creating a random vector whose marginal distributions correspond to X and Y.
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Questions about polynomials with degree $5$. There is no general algebraic solution to these equations as proven by the Abel-Ruffini theorem, although some quintics are solvable.
104 questions
This tag is for questions pertaining to the probabilistic/statistical theory of extreme deviations from the median of probability distributions. A central result of this theory is the Fisher–Tippett–Gnedenko theorem. It is not to be confused with the extreme-value-theorem tag that refers to a theorem for real valued continuous functions on a closed and bounded interval.
104 questions