Fixed point theorems in partially ordered complete metric spaces
In this paper, we present some fixed point theorems in a partially ordered complete metric space X. The usual Caristi's condition that x <= Tx for each x is an element of X is weakened at the expense that the mapping is nondecreasing with respect to a partial order. (C) 2011 Elsevier Ltd. All rights reserved.
fixed point partially ordered complete metric space nondecreasing mapping bounded from below