Tags
A tag is a keyword or label that categorizes your question with other, similar questions.
Questions on the Gibbs measure in any measurable space $(\mathbb{E}^\mathbb{T},\mathcal{F})$ defined by a family of potentials $\Phi=\{\Phi_t\}_{t\in\mathbb{T}}$ in a net $\mathbb{T}$. Here $\mathbb{E}$ is a topological space or a measurable space.
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21 questions
For questions related to graphs which do not contain any element of a family of graphs as a subgraph. E.g., Kuratowski characterized *planar graphs* as those which do not have either a subdivision of the complete graph K_5 on five vertices or a subdivision of the complete bipartite graph K_{3,3} as a subgraph.
21 questions
In statistics, a central tendency (or measure of central tendency) is a central or typical value for a probability distribution. It may also be called a center or location of the distribution. Colloquially, measures of central tendency are often called averages.The tendency for the values of a random variable to cluster round its mean, mode, or median.
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For questions about catastrophic cancellation, the devastating loss of precision when small numbers are computed from large numbers, which themselves are subject to roundoff error.
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[STUB] The study of abstract organization of phenomenon, usually under the assumption of self-regulatory feedback.
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A quotient of the tensor algebra by the ideal generated by symmetric tensors.
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Questions on stochastic programming, a method for modeling optimization problems that involve uncertainty.
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20 questions
Ordered rings are (usually commutative) rings which have an additional structure, a linear order compatible with the ring structure. This tag is for questions regarding ordered rings and their properties, as well proofs related to un-orderability of certain rings.
20 questions
The theory of operator spaces is widely accepted as non-commutative analogue of usual functional analysis. Operator space is a normed $E$ space with some isometric embedding $j:E\to\mathcal{B}(H)$ of $E$ into the space of bounded linear operators on the Hilbert space $H$. The appropriate maps between operator spaces are so called completely bounded maps.
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The Lucas–Lehmer test (LLT) is a primality test for Mersenne numbers.
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20 questions
Everything involving fractional calculus (FC) differential equations: in practical application of FC differential equations; in pure mathematics; numerical methods for the resolution of FDE; dynamical systems; fractional partial differential equations; FDE of distributed order; boundary value problems for FDE; techniques for studying FDE; in a variety of subjects ranging from mathematical physics to probability theory.
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Use this for questions on the spread of disease through a population resulting in an epidemic or epidemics. These questions often encompass the study of differential equations, stochastic processes, markov chains, and machine learning.
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For questions regarding algebraic integers, which is a complex number which is integral over the integers.
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A semigroup that is simultaneously a topological space, and whose semigroup operation is continuous.
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for questions about tomography and tomographical reconstruction, the 2D representation of 3D objects.
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19 questions
Questions on inequalities similar to the classical Gronwall's lemma. Typically, a function's derivative is bounded by (some variation of) itself. This may also be given in the corresponding integral version instead. From there an estimate for the original function can be derived.
19 questions
Classical (or “elliptic”) modular forms are functions in the complex upper
half-plane which transform in a certain way under the action of a discrete
subgroup of SL(2, R) such as SL(2,Z).
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The study of algebraic cycles in algebraic and arithmetic geometry in terms of the Chow group $\operatorname{CH}^*(X)$, the grothendieck group $\operatorname{K}_0(X)$ and the Chern character $ch:\operatorname{K}_0(X)_{\mathbb{Q}}\rightarrow \operatorname{CH}^*(X)_{\mathbb{Q}}$
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Use if your question is about static objects (with no net acceleration) experiencing force and torque or moment.
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For questions about the Mittag-Leffler function, a two-parameter function defined by a series that generalizes the exponential one. Particular cases include trigonometric functions, the error function, etc. It is advisable to also use the [special-functions] tag in conjunction with this tag.
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Use this tag for questions about a particular function defined on the upper half-plane of complex numbers and that is a modular form of weight one-half.
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A chordal graph is one in which all cycles of four or more vertices have a chord, which is an edge that is not part of the cycle but connects two vertices of the cycle.
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An ultrametric space is a metric space in which the triangle inequality is strengthened to $ d ( x , z ) \le \max \lbrace d ( x , y ) , d ( y , z ) \rbrace $.
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A supermanifold is a generalization of the concept of manifold. It consists of a manifold whose local charts contain two types of variables: commuting variables (as in any ordinary manifold) as well as anti-commuting variables.
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For questions regarding the problem of determining the state of a system from an incomplete and potentially noisy set of observations.
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Apt for questions related to stabilizer. Stabilizer of an element $a$ (in a set $M$) is also called the isotropy group of $a$ or the isotropy subgroup of $a$ or the stationary subgroup of $a$.
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For questions regarding the definition, properties and applications of Soddy circles, the kissing circles in Descartes' theorem.
17 questions