Results 31 to 40 of about 220 (84)
Brouwer degree, equivariant maps and tensor powers
Abstract and Applied Analysis, Volume 3, Issue 3-4, Page 401-409, 1998., 1998 A construction of equivariant maps based on factorization through symmetric powers of a faithful representation is presented together with several examples of related equivariant maps. Applications to differential equations are also discussed.
Z. Balanov, W. Krawcewicz, A. Kushkuley
wiley +1 more source
An inverse problem for the compressible Reynolds equation [PDF]
, 2015 We study the existence of solutions to a system of equations for equilibrium positions in lubricated journal bearings under load effects. The mechanism under consideration consists of two parallel cylinders, one inside the other, in close distance and ...
Dager Salomon, Rene +2 more
core +3 more sources
Weak solutions of degenerated quasilinear elliptic equations of higher order
International Journal of Mathematics and Mathematical Sciences, Volume 19, Issue 4, Page 689-706, 1996., 1995 We prove the existence of weak solutions of higher order degenerated quasilinear elliptic equations. The main tools are the degree theory for generalized monotone mappings and imbedding theorems between weighted Sobolev spaces. The straightforward use of these imbeddings allows us to consider more general assumptions than those in our preceding paper ...
Pavel Drábek +2 more
wiley +1 more source
On a local degree for a class of multi‐valued vector fields in infinite dimensional Banach spaces
Abstract and Applied Analysis, Volume 1, Issue 4, Page 381-396, 1996., 1996 This paper is devoted to the development of a local degree for multi‐valued vector fields of the form f − F. Here, f is a single‐valued, proper, nonlinear, Fredholm, C1‐mapping of index zero and F is a multi‐valued upper semicontinuous, admissible, compact mapping with compact images.
N. M. Benkafadar, B. D. Gel′man
wiley +1 more source
Advanced Nonlinear Studies, 2019 Efficient conditions guaranteeing the existence and multiplicity of T-periodic solutions to the second order differential equation u′′=h(t)g(u){u^{\prime\prime}=h(t)g(u)} are established.
Hakl Robert, Zamora Manuel
doaj +1 more source
Nonexistence of positive solutions of nonlinear boundary value problems [PDF]
, 2012 We discuss the nonexistence of positive solutions for nonlinear boundary value problems. In particular, we discuss necessary restrictions on parameters in nonlocal problems in order that (strictly) positive solutions exist.
Webb, Jeff
core +2 more sources
, 2016 We study the second order nonlinear differential equation \begin{equation*} u"+ \sum_{i=1}^{m} \alpha_{i} a_{i}(x)g_{i}(u) - \sum_{j=0}^{m+1} \beta_{j} b_{j}(x)k_{j}(u) = 0, \end{equation*} where $\alpha_{i},\beta_{j}>0$, $a_{i}(x), b_{j}(x)$ are non ...
Feltrin, Guglielmo
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Pairs of positive periodic solutions of nonlinear ODEs with indefinite weight: a topological degree approach for the super-sublinear case [PDF]
, 2015 We study the periodic and the Neumann boundary value problems associated with the second order nonlinear differential equation \begin{equation*} u'' + c u' + \lambda a(t) g(u) = 0, \end{equation*} where $g \colon \mathopen{[}0,+\infty\mathclose{[}\to ...
Boscaggin, Alberto +2 more
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A continuation principle for a class of periodically perturbed autonomous systems
, 2007 In this paper we evaluate the topological index of periodic solutions otained via the Malkin-Loud bifurcation result. Incidentally, we do not assume that the perturbation is differentiale.Comment: Accepted to Math. Nachr., Vol. 281, (2008), No.
Kamenskii, Mikhail +2 more
core +2 more sources
THE ROLE OF LOWER AND UPPER SOLUTIONS IN THE GENERALIZATION OF LIDSTONE PROBLEMS [PDF]
, 2012 In this the authors consider a nonlinear fourth order fully equation coupled with the Lidstone boundary conditions, We discuss how di erent de nitions of lower and upper solutions can generalize existence and location results for boundary value problems ...
Fialho, João, Minhós, Feliz
core