Results 71 to 80 of about 19,014 (240)

Multiple solutions for fourth order $m$-point boundary value problems with sign-changing nonlinearity

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2010
Using a fixed point theorem in ordered Banach spaces with lattice structure founded by Liu and Sun, this paper investigates the multiplicity of nontrivial solutions for fourth order $m$-point boundary value problems with sign-changing nonlinearity.
Haitao Li, Yansheng Liu
doaj   +1 more source

Lattice Ordering on Banach Spaces [PDF]

open access: yesProceedings of the American Mathematical Society, 1952
the American Mathematical Society vol. 3 (1952) pp. 821-828. 2. Nils Sjoberg, Sur les minorantes sousharmoniques d'une fonction donnee, Proceedings of the Ninth Scandanavian Mathematical Congress, Helsingfors, 1938, pp. 309-319. 3. Marcel Brelot, Minorantes sous-harmoniques, extremales et capacites, J. Math. Pures Appl. (9) vol. 24 (1945) pp. 1-32.
openaire   +1 more source

Common Fixed Point Theorems for Order Contractive Mappings on a σ‐Complete Vector Lattice

open access: yesJournal of Mathematics, Volume 2025, Issue 1, 2025.
In this paper, we prove some common fixed point theorems for order contractive mappings on a σ‐complete vector lattice. We apply new results to study the well‐posedness of a common fixed point problem for two contractive mappings. Our proofs are simple and purely order‐theoretic in nature.
Min Wang   +4 more
wiley   +1 more source

Free Banach lattices

open access: yesJournal of the European Mathematical Society
We investigate the structure of the free p -convex Banach lattice {\mathrm{FBL}}^{(p)}[E] over a Banach space E .
Timur Oikhberg   +3 more
openaire   +2 more sources

Heart failure in Europe: Guideline‐directed medical therapy use and decision making in chronic and acute, pre‐existing and de novo, heart failure with reduced, mildly reduced, and preserved ejection fraction – the ESC EORP Heart Failure III Registry

open access: yesEuropean Journal of Heart Failure, Volume 26, Issue 12, Page 2487-2501, December 2024.
The ESC Heart Failure III Registry enrolled 10 162 patients between 2018 and 2020, with acute heart failure (HF) and in the outpatient setting, with pre‐existing and de novo HF, in cardiology and non‐cardiology settings, including patients with HF with reduced (HFrEF), mildly reduced (HFmrEF) and preserved ejection fraction (HFpEF).
Lars H. Lund   +1226 more
wiley   +1 more source

Regularizations of forward‐backward parabolic PDEs

open access: yesGAMM-Mitteilungen, Volume 47, Issue 4, November 2024.
Abstract Forward‐backward parabolic equations have been studied since the 1980s, but a mathematically rigorous picture is still far from being established. As quite a number of new papers have appeared recently, we review in this work the current state of the art.
Carina Geldhauser
wiley   +1 more source

Carleman operators on Banach lattices [PDF]

open access: yesMathematische Zeitschrift, 1988
An abstract Carleman operator between Banach lattices is characterized in terms of convergence properties with respect to appropriate representation spaces. This extends classical results for Carleman operators on \(L^ 2\)-spaces. In special cases, integral descriptions are provided.
openaire   +2 more sources

Substitutions and their Generalisations

open access: yesIsrael Journal of Chemistry, Volume 64, Issue 10-11, November 2024.
Abstract Tilings and point sets arising from substitutions are classical mathematical models of quasicrystals. Their hierarchical structure allows one to obtain concrete answers regarding spectral questions tied to the underlying measures and potentials.
Neil Mañibo
wiley   +1 more source

An absolute continuity for positive operators on Banach lattices

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 1991
For positive operators on a Banach lattice, absolute contnuity conditions are considered. An operator absolutely continuous with respect to T is compared to sums of compositions of T together with orthomorphisms or in special cases projections ...
W. Feldman   +2 more
doaj   +1 more source

Approximation of a two‐dimensional Gross–Pitaevskii equation with a periodic potential in the tight‐binding limit

open access: yesMathematische Nachrichten, Volume 297, Issue 10, Page 3870-3886, October 2024.
Abstract The Gross–Pitaevskii (GP) equation is a model for the description of the dynamics of Bose–Einstein condensates. Here, we consider the GP equation in a two‐dimensional setting with an external periodic potential in the x$x$‐direction and a harmonic oscillator potential in the y$y$‐direction in the so‐called tight‐binding limit.
Steffen Gilg, Guido Schneider
wiley   +1 more source

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