Results 31 to 40 of about 4,227,419 (291)
Class of solutions of the Wheeler-DeWitt equation with ordering parameter
Physics Letters B, 2020 In this letter, we discuss the Wheeler-DeWitt equation with an ordering parameter in the Friedmann-Robertson-Walker universe. The solutions when the universe was very small and at the end of the expansion are obtained in terms of Bessel and Heun ...
H.S. Vieira +4 more
doaj +1 more source
On a Class of Sobolev-Type Equations
Bulletin of the South Ural State University. Series "Mathematical Modelling, Programming and Computer Software", 2014 The article surveys the works of T.G. Sukacheva and her students studying the models of incompressible viscoelastic Kelvin Voigt uids in the framework of the theory of semilinear Sobolev-type equations. We focus on the unstable case because of greater generality. The idea is illustrated by an example: the non-stationary thermoconvection problem for the
Sukacheva, T., Kondyukov, A.
openaire +3 more sources
A Class of Soluble Diophantine Equations [PDF]
Proceedings of the National Academy of Sciences, 1951 Let R be a commutative ring with a unit element, F(x) a homogeneous polynomial of degree n in t indeterminates x1, x2, ..., xt with coefficients in R. Let I denote the subring of the coefficients of F(x) in R; that is, the smallest ring containing all of them.
openaire +3 more sources
Mentoring for Faculty from Working-Class Backgrounds
, 2020 Faculty mentoring across gender, race, and culture is facilitated by formal mentoring programs. Mentoring across the cultural differences associated with social class, however, represents a largely unaddressed gap in the provision of formal faculty ...
Poulsen, Joan R. +3 more
core +2 more sources
Moving boundary problems for a novel extended mKdV equation. Application of Ermakov-Painlevé II symmetry reduction [PDF]
Open Communications in Nonlinear Mathematical PhysicsA novel extension of the canonical solitonic mKdV equation is introduced which admits hybrid Ermakov-Painlevé II symmetry reduction. Application of the latter is made to obtain exact solution of Airy-type to a class of moving boundary problems of Stefan ...
Colin Rogers, Adriana C. Briozzo
doaj +1 more source
Criteria for Oscillation of Half-Linear Functional Differential Equations of Second-Order
Axioms, 2022 The present article aims to establish more effective criteria for testing the oscillation of a class of functional differential equations with delay arguments.
Barakah Almarri, Osama Moaaz, Ali Muhib
doaj +1 more source
An existence result for a semipositone problem with a sign changing weight
Abstract and Applied Analysis, 2006 We establish an existence result on positive solution for a class of reaction-diffusion equation with semipositone structure. In particular, our results apply to the diffusive logistic equation with a class of sign changing weight and constant yield ...
Jaffar Ali, R. Shivaji
doaj +2 more sources
Equational classes of lattices
Duke Mathematical Journal, 1966 In this section we shall discuss the basic properties of equational classes of lattices. Of the four characterizations and descriptions given, three apply to arbitrary equational classes of universal algebras; the fourth is valid only for those equational classes of universal algebras that are congruence distributive (that is, the congruence lattice of
openaire +3 more sources
On differential equations invariant under a projective transformation group: integrability and reductions [PDF]
Open Communications in Nonlinear Mathematical PhysicsWe consider a projective transformation and establish the invariants for this transformation group up to order seven. We use the obtained invariants to construct a class of nonlinear evolution equations and identify some symmetry-integrable equations in ...
Marianna Euler +2 more
doaj +1 more source
Therapeutic Apheresis and Dialysis, EarlyView.ABSTRACT Introduction This study investigated the safety and efficacy of single‐needle Rheocarna therapy for chronic limb‐threatening ischemia (CLTI) with wounds. Methods Six patients with CLTI involving ulcers unresponsive to revascularization underwent single‐needle Rheocarna treatment.
Yasutaka Yamauchi +9 more
wiley +1 more source