Functional equations for real functions

Results 141 to 150 of about 577,125 (180)

Calderón problem for nonlocal viscous wave equations: Unique determination of linear and nonlinear perturbations. [PDF]

Rev R Acad Cienc Exactas Fis Nat A Mat
Zimmermann P.
europepmc +1 more source

Dynamic Properties in a Collisional Model for Confined Granular Fluids: A Review. [PDF]

Entropy (Basel)
Brito R, Soto R, Garzó V.
europepmc +1 more source

Absence of Real Roots of Characteristic Functions of Functional Differential Equations with Nine Real Parameters

Taiwanese Journal of Mathematics, 2011
The authors consider the first order neutral functional-differential equation of the form \[ au'(t)+bu(t)+(cu'(t+\sigma)+du(t+\sigma))+xu(t+\delta)+yu(t+\tau)=0, \] where \(a, b, c, d, x, y, \sigma, \delta, \tau\) are real parameters, and intend to find the exact region containing these parameters such that all solutions of the above equation oscillate.
Shao-Yuan Huang
exaly +3 more sources

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mathematics
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Functional equations for the functions of real variables

Moscow University Computational Mathematics and Cybernetics, 2014
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
S S Marchenkov
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Functional equations in real-analytic functions [PDF]

Studia Mathematica, 2000
Consider the functional equation \[ \phi(x)=g(x,\phi(Fx)) \] where \(F:X\to X\) (\(X\) real analytic manifold countable at infinity, \(dim X=m\)), \(g:X\times \mathbb R^n \to \mathbb R^n\) and \(\phi:X \to \mathbb R^n\) are real-analytic functions (\(\phi\) is the unknown function).
Belitskii, G., Tkachenko, V.
exaly +3 more sources

Real-Time Equation-of-Motion CCSD Cumulant Green’s Function

Journal of Chemical Theory and Computation, 2022
Many-body excitations in X-ray photoemission spectra have been difficult to simulate from first principles. We have recently developed a cumulant-based one-electron Green's function method using the real-time coupled-cluster-singles equation-of-motion approach (RT-EOM-CCS) that provides a general framework for treating these problems.
F. D. Vila +4 more
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REAL THETA-FUNCTION SOLUTIONS OF THE KADOMTSEV–PETVIASHVILI EQUATION

Mathematics of the USSR-Izvestiya, 1989
This paper is devoted to the problem of extracting the smooth real solutions of the Kadomtsev-Petviashvili equation from the class of quasi- periodic complex meromorphic solutions constructed by I. M. Krichever. Necessary and sufficient conditions for smoothness and reality of the solutions are found.
Dubrovin, Boris, Natanzon, Sergei
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Functional equation of Dhombres type in the real case

Publicationes Mathematicae Debrecen, 2011
We consider continuous solutions f : R+ ! R+ = (0,1) of the functional equation f(xf(x)) = o(f(x)) where o is a given continuous map R+ ! R+. If o is an increasing homeomorphism the solutions are completely described, if not there are only partial results. In this paper we bring some necessary conditions upon a possible range Rf .
LUDWIG REICH, JAROSLAV SMITAL, MARTA STEFANKOVA +2 more
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Satisfiability of Systems of Equations of Real Analytic Functions Is Quasi-decidable

2011
In this paper we consider the problem of checking whether a system of equations of real analytic functions is satisfiable, that is, whether it has a solution. We prove that there is an algorithm (possibly non-terminating) for this problem such that (1) whenever it terminates, it computes a correct answer, and (2) it always terminates when the input is ...
Franek, P. (Peter) +2 more
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Isometry of the Subspaces of Solutions of Systems of Differential Equations to the Spaces of Real Functions

Ukrainian Mathematical Journal, 2019
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Abdullayev, F. G. +3 more
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mathematics
multiple solutions