Solution of the Chen-Chvatal conjecture for specific classes of metric spaces

Identifier:  imarina:9225163

Handle: https://hdl.handle.net/20.500.11797/imarina9225163

Authors:  Alberto Rodriguez-Velazquez, Juan

Abstract:
In a metric space (X, d), a line induced by two distinct points x, x' is an element of X, denoted by {x pound, x'}, is the set of points given by{x pound, x'} = {z is an element of X : d(x, x') = d(x, z) + d(z, x') or d(x, x') = |d(x, z) - d(z, x')|}.A line {x pound, x'} is universal whenever {x pound, x'} = X.Chen and Chvatal [Discrete Appl. Math. 156 (2008), 2101-2108.] conjectured that every finite metric space on n >= 2 points either has at least n distinct lines or has a universal line. In this paper, we prove this conjecture for some classes of metric spaces.In particular, we discuss the classes of Cartesian metric spaces, lexicographic metric spaces and corona metric spaces.