Browsing University of Galway Support Services by Author "Yan, Baoqiang"
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Fixed-point theorems for nonlinear operators with singular perturbations and applications
Yan, Baoqiang; O’Regan, Donal; Agarwal, Ravi P (Springer Nature, 2014-01-01)In this paper, using fixed-point index theory and approximation techniques, we consider the existence and multiplicity of fixed points of some nonlinear operators with singular perturbation. As an application we consider ... -
Multiplicity and uniqueness results for the singular nonlocal boundary value problem involving nonlinear integral conditions
Yan, Baoqiang; O’Regan, Donal; Agarwal, Ravi P (Springer Nature, 2014-09-25)In this paper, using fixed point index and the mixed monotone technique, we present some multiplicity and uniqueness results for the singular nonlocal boundary value problems involving nonlinear integral conditions. Our ... -
Positive solutions for singular nonlocal boundary value problems involving integral conditions with derivative dependence
Yan, Baoqiang; O’Regan, Donal; Agarwal, Ravi P. (Walter de Gruyter GmbH, 2015-01-01)In this paper using a fixed point theory on a cone we present some new results on the existence of multiple positive solutions for singular nonlocal boundary value problems involving integral conditions with derivative dependence. -
The existence of positive solutions for kirchhoff-type problems via the sub-supersolution method
Yan, Baoqiang; O’Regan, Donal; Agarwal, Ravi P. (Walter de Gruyter GmbH, 2018-03-01)In this paper we discuss the existence of a solution between well ordered subsolution and supersolution of the Kirchhoff equation. Using the sub-supersolution method together with a Rabinowitz-type global bifurcation theory, ... -
Unbounded positive solutions for second order singular boundary value problems with derivative dependence on infinite intervals
Yan, Baoqiang; O'Regan, Donal; Agarwal, Ravi P. (Division of Functional Equations, The Mathematical Society of Japan (JST), 2008-01-01)The existence of at least one unbounded positive solution and the existence of multiple unbounded positive solutions are established for the singular second-order boundary value problem p(t)(-1)(p(t)x'(t))' + Phi(t)f(t,x,px') ... -
Unbounded solutions for singular boundary value problems on the semi-infinite interval: upper and lower solutions and multiplicity
Yan, Baoqiang; O’Regan, Donal; Agarwal, Ravi P. (Elsevier BV, 2006-12-01)