# Triple positive solution to the one-dimensional <var>p</var>-Laplacian equation

### Xuemei Zhang

North China Electric Power University, Beijing, China### Meiqiang Feng

Beijing Institute of Technology, China### Weigao Ge

Beijing Institute of Technology, China

## Abstract

We obtain sufficient conditions for the existence of at least three positive solutions to the second-order nonlinear delay differential equation with one-dimensional p-Laplacian

(Φp(x'(t)))' + w(t) f(t, x(t), x(t − τ), x'(t)) = 0, t ∈ (0,1), τ > 0,

x(t) = 0, −τ ≤ t ≤ 0,

x(1) = 0,

where Φp(s) is the p-Laplacian operator, i.e., Φp(s) = |s|p−2s, p > 1, (Φp)−1 = Φq, 1/p + 1/q = 1. The arguments are based upon a new fixed point theorem in a cone introduced by Avery and Peterson.

## Cite this article

Xuemei Zhang, Meiqiang Feng, Weigao Ge, Triple positive solution to the one-dimensional <var>p</var>-Laplacian equation. Port. Math. 65 (2008), no. 1, pp. 143–155

DOI 10.4171/PM/1803