Results 71 to 80 of about 12,947 (248)

On the existence of positive solutions for an ecological model with indefinite weight

Arab Journal of Mathematical Sciences, 2016
This study concerns the existence of positive solutions for the following nonlinear boundary value problem: {−Δu=am(x)u−bu2−cupup+1−Kin  Ω,u=0on  ∂Ω, where Δu=div(∇u) is the Laplacian of u, while a,b,c,p,K are positive constants with p≥2 and Ω is a ...
Saleh Shakeri, Ghasem A. Afrouzi, Armin Hadjian   +2 more
doaj   +1 more source

Linear elliptic eigenvalue problems involving an indefinite weight

Journal of Mathematical Analysis and Applications, 1987
Die Verff. untersuchen lineare Eigenwertprobleme vom Typ \[ (Lu)(x)=\lambda m(x)u(x),\quad x\in \Omega, \] wobei L ein linearer, stark elliptischer Differentialoperator ist, \(\Omega\) ein Gebiet mit beschränktem Rand, sowie m(x) eine Funktion, die sowohl positive als auch negative Werte annimmt.
Faierman, M, Roach, G.F
openaire   +2 more sources

South Africa: The Ambiguities of a Middle Power

Global Policy, EarlyView.
ABSTRACT South Africa represents an interesting species of a middle power. This derives from its inherited economic muscle as Africa's powerhouse and the liberation struggle against apartheid, both of which have shaped its democratic transition. The traditions of liberation and democracy, in turn, have profoundly influenced how South Africa has ...
Garth L. le Pere
wiley   +1 more source

On the spectrum of the p-biharmonic operator

Electronic Journal of Differential Equations, 2002
This work is devoted to the study of the spectrum for p-biharmonic operator with an indefinite weight in a bounded domain.
Abdelouahed El Khalil, Siham Kellati, Abdelfattah Touzani   +2 more
doaj  

An existence result for a Robin problem involving $p(x)$-Kirchhoff-type equation with indefinite weight [PDF]

AUT Journal of Mathematics and Computing
This paper discusses the existence of at least two distinct nontrivial weak solutions for a class of $p(x)$-Kirchhoff-type equation plus an indefinite potential under Robin boundary condition.
Mehdi Latifi, Mohsen Alimohammady
doaj   +1 more source

Measuring the time‐varying market efficiency in the prewar and wartime Japanese stock market, 1924–1943

Asia‐Pacific Economic History Review, Volume 65, Issue 1, Page 131-159, March 2025.
Abstract This study examines the adaptive market hypothesis in the prewar and wartime Japanese stock market using a new market capitalization‐weighted price index. First, we find that the degree of market efficiency varies over time and with major historical events. This implies that the hypothesis is supported in this market.
Kenichi Hirayama, Akihiko Noda
wiley   +1 more source

A spectral problem with an indefinite weight for an elliptic system

Electronic Journal of Differential Equations, 1997
We establish the completeness and the summability in the sense of Abel-Lidskij of the root vectors of a non-selfadjoint elliptic problem with an indefinite weight matrix and the angular distribution of its eigenvalues.
Mamadou Sango
doaj  

Indefinite weight nonlinear problems with Neumann boundary conditions

Journal of Mathematical Analysis and Applications, 2017
The paper concerns the existence of multiple positive solutions to the second-order differential equation \[ u''+a(t)g(u)=0 \] posed on the bounded interval \([0,T]\) and associated with Neumann boundary conditions \(u'(0)=u'(T)=0\). The function \(g\) is such that \(g(0)=0\) and \(g(s)>0\) for positive \(s\) while the coefficient \(a\) has indefinite ...
Sovrano, Elisa, Zanolin, Fabio
openaire   +1 more source

High Risk of Colorectal Cancer After High‐Grade Dysplasia in Inflammatory Bowel Disease Patients

Alimentary Pharmacology &Therapeutics, EarlyView.
The advantages of colon‐sparing treatment for high‐grade dysplasia should be weighed against the higher risk of metachronous colorectal cancer and the subsequent need for stringent endoscopic surveillance. ABSTRACT Background There are limited data on colorectal cancer (CRC) risk after high‐grade dysplasia in inflammatory bowel disease.
Monica E. W. Derks, Maarten te Groen, Lauranne A. A. P. Derikx, Iris D. Nagtegaal, Frank Hoentjen   +4 more
wiley   +1 more source

Self‐Giving and Reflections on Life Extension: How Love Might Shape the Choice of Whether to Live Past a Natural Human Lifespan

Bioethics, EarlyView.
ABSTRACT Drawing upon a deprivationist account of the badness of death, Ingemar Patrick Linden advocates for a hypothetical state called “contingent immortality.” The future Linden champions is one in which every person would be able to live for as long as they would like, save for events like accidents or murder.
Andrew Moeller, Ann‐Marie Shorrocks, Keith Lemna   +2 more
wiley   +1 more source