Found 46 Documents (Results 1–46)
Periodic solutions to superlinear indefinite planar systems: a topological degree approach. (English) Zbl 1520.34036
Reviewer: Alessandro Fonda (Trieste)
Positive solutions for a Minkowski-curvature equation with indefinite weight and super-exponential nonlinearity. (English) Zbl 1519.34022
Reviewer: Alessandro Fonda (Trieste)
Nonnegative solutions of an indefinite sublinear Robin problem. II: Local and global exactness results. (English) Zbl 1492.35115
Reviewer: Dumitru Motreanu (Perpignan)
Uniqueness of positive solutions for boundary value problems associated with indefinite \(\phi\)-Laplacian-type equations. (English) Zbl 1475.34021
Uniqueness and sign properties of minimizers in a quasilinear indefinite problem. (English) Zbl 1480.35272
\(S\)-shaped connected component of positive solutions for second-order discrete Neumann boundary value problems. (English) Zbl 1478.39017
Numerical global bifurcation diagrams for a superlinear indefinite problem with a parameter appearing in the domain. (English) Zbl 1460.65157
Nonnegative solutions of an indefinite sublinear Robin problem. I: positivity, exact multiplicity, and existence of a subcontinuum. (English) Zbl 1448.35249
Reviewer: Dumitru Motreanu (Perpignan)
High multiplicity and chaos for an indefinite problem arising from genetic models. (English) Zbl 1452.34032
Reviewer: Bertin Zinsou (Johannesburg)
Positive periodic solutions to an indefinite Minkowski-curvature equation. (English) Zbl 1445.34064
Reviewer: Alessandro Fonda (Trieste)
Multiplicity of clines for systems of indefinite differential equations arising from a multilocus population genetics model. (English) Zbl 1441.34033
Reviewer: Yanqiong Lu (Lanzhou)
A curve of positive solutions for an indefinite sublinear Dirichlet problem. (English) Zbl 1433.35137
Existence and multiplicity of periodic solutions to indefinite singular equations having a non-monotone term with two singularities. (English) Zbl 1422.34139
Reviewer: Narahari Parhi (Bhubaneswar)
An indefinite nonlinear problem in population dynamics: high multiplicity of positive solutions. (English) Zbl 1400.34035
Reviewer: Andreas Fleige (Dortmund)
Positive solutions of an elliptic Neumann problem with a sublinear indefinite nonlinearity. (English) Zbl 1391.35159
A negative answer to a conjecture arising in the study of selection-migration models in population genetics. (English) Zbl 1390.92091
Positive solutions for super-sublinear indefinite problems: high multiplicity results via coincidence degree. (English) Zbl 1393.34038
Reviewer: Gennaro Infante (Arcavata di Rende)
Positive subharmonic solutions to nonlinear ODEs with indefinite weight. (English) Zbl 1381.34056
Reviewer: Alessandro Fonda (Trieste)
Indefinite weight nonlinear problems with Neumann boundary conditions. (English) Zbl 1387.34040
Reviewer: Smail Djebali (Algiers)
MSC:
34B18
Multiple positive solutions to elliptic boundary blow-up problems. (English) Zbl 1378.35131
Reviewer: Dumitru Motreanu (Juiz de Fora)
An indefinite concave-convex equation under a Neumann boundary condition. I. (English) Zbl 1376.35034
Reviewer: Dumitru Motreanu (Juiz de Fora)
Positivity results for indefinite sublinear elliptic problems via a continuity argument. (English) Zbl 1393.35059
Reviewer: Rodica Luca (Iaşi)
Bifurcation of positive solutions for a one-dimensional indefinite quasilinear Neumann problem. (English) Zbl 1419.34101
Periodic solutions to second-order indefinite singular equations. (English) Zbl 1367.34045
Reviewer: Alessandro Fonda (Trieste)
Positive solutions of a one-dimensional indefinite capillarity-type problem: a variational approach. (English) Zbl 1362.34042
Reviewer: Giovanni Anello (Messina)
Positive steady states of an indefinite equation with a nonlinear boundary condition: existence, multiplicity, stability and asymptotic profiles. (English) Zbl 1357.35108
Reviewer: Dumitru Motreanu (Perpignan)
On a concave-convex elliptic problem with a nonlinear boundary condition. (English) Zbl 1359.35042
Reviewer: Florin Catrina (New York)
Positive solutions to indefinite Neumann problems when the weight has positive average. (English) Zbl 1359.34033
Reviewer: Anna Capietto (Torino)
Multiple solutions to Neumann problems with indefinite weight and bounded nonlinearities. (English) Zbl 1335.34058
Second-order ordinary differential equations with indefinite weight: the Neumann boundary value problem. (English) Zbl 1321.34034
Reviewer: Ekin Uğurlu (Ankara)
MSC:
34B15
Pairs of positive periodic solutions of second order nonlinear equations with indefinite weight. (English) Zbl 1243.34055
Reviewer: Fengqin Zhang (Yuncheng)
Nonnegative solutions of elliptic problems with sublinear indefinite nonlinearity. (English) Zbl 1235.35124
Reviewer: John Urbas (Canberra)
A note on a superlinear indefinite Neumann problem with multiple positive solutions. (English) Zbl 1223.34022
Reviewer: Smail Djebali (Algiers)
Compactly supported solutions to stationary degenerate diffusion equations. (English) Zbl 1165.35013
A free boundary problem involving convection and singular absorption. (English) Zbl 0952.34016
Reviewer: J.Diblík (Brno)
On a class of nonlinear Neumann problems of parabolic type: Blow-up of solutions. (English) Zbl 0862.35049
Positive solution of some nonlinear elliptic equation with Neumann boundary conditions. (English) Zbl 0851.35045
MSC:
35J65
Variational methods for indefinite superlinear homogeneous elliptic problems. (English) Zbl 0840.35035
Reviewer: K.Pflüger (Berlin)
On a class of nonlinear Neumann problems. (English) Zbl 0737.35022
Reviewer: L.Nicolaescu (East Lansing)
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