Abstract
We study some existence results in a Banach space for a nonlocal boundary value problem involving a nonlinear differential equation of fractional order q given by (c)D(q)x(t) = f(t, x(t)), 0 < t < 1, q is an element of (m - 1, m], m is an element of N, m >= 2, x(0) = 0, x'(0) = 0, x ''(0) = 0,..., x((m-2))(0) = 0, x(1) = alpha x (eta). Our results are based on the contraction mapping principle and Krasnoselskii's fixed point theorem. Copyright (C) 2009 B. Ahmad and J. J. Nieto.