Results 41 to 50 of about 4,197 (120)

Singular and Totally Singular Unitary Spaces [PDF]

Communications in Algebra, 2015
In this article, we present a decomposition theorem for unitary spaces over a central simple division algebra with involution in characteristic 2. This is a generalization of a decomposition result for quadratic forms in characteristic 2 from [4] and extends a generalization of the Witt decomposition theorem for nonsingular spaces in this setting to ...
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Quantum imploding scalar fields [PDF]

Royal Society Open Science, 2018
The d’Alembertian □ϕ = 0 has the solution ϕ = f(v)/r, where f is a function of a null coordinate v, and this allows creation of a divergent singularity out of nothing.
Mark D. Roberts
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Investigation on the Singularities of Some Singular Integrals

Computer Modeling in Engineering & Sciences, 2011
In a boundary element method, the treatment of all the possible singular integrals is very important for the correctness and accuracy of the solutions. Generally, the directional derivative of a weakly singular integral is computed by an integral in the sense of Cauchy principal value if the directional derivative of the weakly singular integral kernel
Yan, Zai You, Zhang, Qiang
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Singular truth-conditions without singular propositions [PDF]

Synthese, 2017
In this paper I argue that propositionalism (the doctrine that the contents of thoughts and utterances are propositions to be evaluated with respect to possible worlds) is what generates a tension between referentialism and harmony (the traditional idea that cognitive values can be fully explained by means of truth-conditional contents). Harmony can be
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On a singular Riemann–Liouville fractional boundary value problem with parameters

Nonlinear Analysis, 2021
We investigate the existence of positive solutions for a nonlinear Riemann–Liouville fractional differential equation with a positive parameter subject to nonlocal boundary conditions, which contain fractional derivatives and Riemann–Stieltjes integrals.
Alexandru Tudorache, Rodica Luca
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Singular LQ Problem for Irregular Singular Systems

Journal of Applied Mathematics, 2014
This paper is concerned with the singular LQ problem for irregular singular systems with persistent disturbances. The full information feedback control method is employed to achieve the optimal control. By restricted system equivalence transformation, the system state is decomposed into free state and restricted state and the input is decomposed into ...
Qingxiang Fang, Baolin Zhang 0001, Jun-e Feng   +2 more
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On the distance function in domains with boundary

Bruno Pini Mathematical Analysis Seminar
We present some results on the regularity and the singularities of the distance function in domains with boundary.
Paolo Albano
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On the Links of Simple Singularities, Simple Elliptic Singularities and Cusp Singularities

Demonstratio Mathematica, 2015
Abstract This is a survey article about the study of the links of some complex hypersurface singularities in ℂ3 . We study the links of simple singularities, simple elliptic singularities and cusp singularities, and the canonical contact structures on them. It is known that each singularity link is diffeomorphic to a compact quotient of
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Optimal Shadowing Filter for a Positioning and Tracking Methodology with Limited Information

Sensors, 2019
Positioning and tracking a moving target from limited positional information is a frequently-encountered problem. For given noisy observations of the target’s position, one wants to estimate the true trajectory and reconstruct the full phase space ...
Ayham Zaitouny, Thomas Stemler, Shannon Dee Algar   +2 more
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A Primer on Spacetime Singularities I: Mathematical Framework

Universe
This article presents a comprehensive and rigorous overview of spacetime singularities within the framework of classical General Relativity. Singularities are defined through the failure of geodesic completeness, reflecting the limits of predictability ...
Jean-Pierre Luminet
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