Tags
A tag is a keyword or label that categorizes your question with other, similar questions.
This tag is for questions relating to "Hidden Markov model", a statistical Markov model in which the system being modeled is assumed to be a Markov process with unobservable (i.e. hidden) states.
93 questions
The study of topological invariants of contact manifolds, the odd-dimensional counterpart of symplectic manifolds. Classical mechanics has a 2n-dimensional phase space and one time dimension and the definition of contact manifolds axiomatizes this structure by positing a maximally non-integrable hyperplane distribution. Fields of application include low-dimensional topology, 3-manifolds and knots, geometrical optics, thermodynamics and control theory.
93 questions
For questions about risk assessment, a systematic process of evaluating the potential risks that may be involved in a projected activity or undertaking.
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For questions on locally connected topological spaces. A topological space is called locally connected if every neighborhood of every point contains a connected open neighborhood.
92 questions
For questions about special identities and problems involving Catalan's constant as well as general questions about the constant itself.
92 questions
The Wiener measure is the probability law on the space of continuous functions $g$ with $g(0)=0$, induced by the Wiener process.
91 questions
91 questions
The theory that develops differential calculus for functions that are not differentiable in the usual sense.
91 questions
For questions about the Baire space, that is the family $\mathbb{N}^\mathbb{N}$ of all sequences of natural numbers with the product topology. For questions about the class of Baire spaces - spaces in which Baire category theorem holds - use (baire-category) tag.
90 questions
Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a $9\times9$ grid with digits so that each column, each row, and each of the nine $3\times3$ subgrids that compose the grid (also called "boxes", "blocks", "regions" or "subsquares") contain all the digits from $1$ to $9$. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a unique solution.
90 questions
Use this tag for questions related to algorithmic randomness, which is the study of random individual elements in sample spaces.
90 questions
For questions about the singular solution of the ordinary differential equations. It is a special type of solution different from general solution. Such solutions does not contain any arbitrary constant and is not a particular case of the general solution.
89 questions
For questions about the Riemann sphere, a model of the extended complex plane.
89 questions
Quasiconformal maps are generalizations of conformal maps. They started out being used in Nevanlinna's value distribution theory but now form a fundamental component of geometric function theory. This tag is for questions related to QC maps.
89 questions
89 questions
Questions about or involving equivariant maps, the natural maps between $G$-sets.
89 questions
Questions about the trace map on Sobolev spaces, which maps a function on a domain to its boundary values, and generalizations or related concepts. Consider using [sobolev-spaces] as well. For questions about the trace of a matrix or other meanings of trace, please use [trace] instead.
88 questions
Question on bits and pieces of mathematics that show up in popular media (TV, movies, comics, etc.)
88 questions
is related to control theory, dynamic optimization and statistical methods to build mathematical models based on some measured data.
87 questions
For questions about the Sorgenfrey line ($\mathbb{R}$ with the lower limit topology) and closely related spaces.
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For questions about the algebra used for modeling the data stored in relational databases.
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For questions on rationalising the denominator, the operation of rewriting a fraction in such a way that the denominator is free of square roots, cube roots, etc. The fraction can be a real number involving radicals, but also a function.
87 questions
Schubert calculus is the study of flag varieties, which are quotients of algebraic groups (usually complex semisimple, but sometimes over the real numbers or even finite fields) by parabolic subgroups.
86 questions
In combinatorics, a *necklace* of length $n$ is an equivalence class of strings of length $n$, under rotation, so $abcde = bcdea$. A *bracelet* is an equivalence class of strings under rotation and reflection (so in addition $abcde = edcba$).
86 questions
Transcendental functions are those functions that do not satisfy an algebraic equation.
85 questions