Advances in Difference Equations
Volume 2005 (2005), Issue 2, Pages 205-214
doi:10.1155/ADE.2005.205
Construction of upper and lower solutions for singular discrete initial and boundary value problems via inequality theory
Haishen Lü1
and Donal O'Regan2
1Department of Applied Mathematics, Hohai University, Nanjing 210098, China
2Department of Mathematics, National University of Ireland, Galway, Ireland
Abstract
We present new existence results for singular discrete initial and boundary value problems. In particular our nonlinearity may be singular in its dependent variable and is allowed to change sign.