Convex solutions of the polynomial-like iterative equation on open set
Bull. Korean Math. Soc. 2014 Vol. 51, No. 3, 641-651
https://doi.org/10.4134/BKMS.2014.51.3.641
Published online May 31, 2014
Xiaobing Gong
Neijiang Normal University
Abstract : Because of difficulty of using Schauder's fixed point theorem to the polynomial-like iterative equation, a lots of work are contributed to the existence of solutions for the polynomial-like iterative equation on compact set. In this paper, by applying the Schauder-Tychonoff fixed point theorem we discuss monotone solutions and convex solutions of the polynomial-like iterative equation on an open set (possibly unbounded) in $\mathbb{R}^{N}$. More concretely, by considering a partial order in $\mathbb{R}^{N}$ defined by an order cone, we prove the existence of increasing and decreasing solutions of the polynomial-like iterative equation on an open set and further obtain the conditions under which the solutions are convex in the order.
Keywords : iterative equation, open set, order, increasing operator and decreasing operator
MSC numbers : 39B12, 58F08
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