 
Summary: POSITIVITY OF GREEN'S FUNCTION
FOR AN nPOINT RIGHT FOCAL
BOUNDARY VALUE PROBLEM ON
MEASURE CHAINS
Douglas Anderson
Department of Mathematics and Computer Science
Concordia College
Moorhead, MN 56562
andersod@cord.edu
Abstract
We determine sufficient conditions for the positivity of Green's function for
an npoint right focal boundary value problem on measure chains whose forward
jump operator is delta differentiable. For n = 3, 4 and various measure chains
we see that positivity depends on the distances between boundary points.
Key words: measure chains, Green's function.
AMS Subject Classification. 39A10.
1 INTRODUCTION
Define the operator L by
Lx(t) := (1)n1
xn
