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6 papers · 1 filter
Nonsingular parametric oscillators Darboux-related to the classical harmonic oscillator
H. C. Rosu, O. Cornejo-Perez, P. Chen
Interesting nonsingular parametric oscillators which are Darboux related to the classical harmonic oscillator and have periodic dissipative/gain features are identified through a m…
Null and non--rainbow colorings of projective plane and sphere triangulations
Jorge L. Arocha, Amanda Montejano
For maximal planar graphs of order , we prove that a vertex--coloring containing no rainbow faces uses at most colors, and this is best poss…
Riesz Kernels and Pseudodifferential Operators Attached to Quadratic Forms Over p-adic Fields
O. Casas-Sanchez, W. A. Zuniga-Galindo
We study pseudodifferential equations and Riesz kernels attached to certain quadratic forms over p-adic fields. We attach to an elliptic quadratic form of dimension two or four a f…
Wave polynomials, transmutations and Cauchy's problem for the Klein-Gordon equation
Kira V. Khmelnytskaya, Vladislav V. Kravchenko, Sergii M. Torba +1
We prove a completeness result for a class of polynomial solutions of the wave equation called wave polynomials and construct generalized wave polynomials, solutions of the Klein-G…
The equal tangents property
J. Jeronimo-Castro, G. Ruiz-Hernandez, S. Tabachnikov
Let M be a smooth strictly convex closed surface in space and denote by H the set of points x in the exterior of M such that all the tangent segments from x to M have equal lengths…
Exact solutions of a Flat Full Causal Bulk viscous FRW cosmological model through factorization
O. Cornejo-Pérez, J. A. Belinchón
We study the classical flat full causal bulk viscous FRW cosmological model through the factorization method. The method shows that there exists a relationship between the viscosit…