Results 1 
3 of
3
The symmetric traveling salesman polytope: New facets from the graphical relaxation
 MATHEMATICS OF OPERATIONS RESEARCH
, 2007
"... ..."
(Show Context)
On the parsimonious property of relaxations of the symmetric traveling salesman polytope. arXiv/math.CO:blah, submitted
"... ABSTRACT. We relate the parsimonious property of relaxations of the Symmetric Traveling Salesman Polytope to a connectivity property of the ridge graph of the Graphical Traveling Salesman Polyhedron. This relationship is quite surprising. The proof is elegant and geometric: it makes use of recent re ..."
Abstract

Cited by 1 (1 self)
 Add to MetaCart
(Show Context)
ABSTRACT. We relate the parsimonious property of relaxations of the Symmetric Traveling Salesman Polytope to a connectivity property of the ridge graph of the Graphical Traveling Salesman Polyhedron. This relationship is quite surprising. The proof is elegant and geometric: it makes use of recent results on “flattening ” parts of the boundary complex of the polar of the Graphical Traveling Salesman Polyhedron. The Symmetric Traveling Salesman Polytope STSP(n) is the convex hull of all cycles (connected 2regular graphs) on a fixed vertex set V of cardinality n. The Graphical Traveling Salesman Polyhedron GTSP(n) is the convex hull of all connected Eulerian multigraphs a fixed vertex set on V. It contains STSP(n) as a face, defined by a certain system of linear equations. A relaxation is a system of linear inequalities which are facetdefining for STSP(n) and GTSP(n). It has the parsimonious property if, for a certain set of linear objective functions, the following holds: the minimum of this function over the relaxation does not increase when the above mentioned equations are added to the relaxation. 1.
ON THE FACIAL STRUCTURE OF SYMMETRIC AND GRAPHICAL TRAVELING SALESMAN POLYHEDRA
, 2009
"... The Symmetric Traveling Salesman Polytope Sn for a fixed number n of cities is a face of the corresponding Graphical Traveling Salesman Polyhedron Pn. This has been used to study facets of Sn using Pn as a tool. In this paper, we study the operation of “rotating” (or “lifting”) valid inequalities fo ..."
Abstract
 Add to MetaCart
(Show Context)
The Symmetric Traveling Salesman Polytope Sn for a fixed number n of cities is a face of the corresponding Graphical Traveling Salesman Polyhedron Pn. This has been used to study facets of Sn using Pn as a tool. In this paper, we study the operation of “rotating” (or “lifting”) valid inequalities for Sn to obtain a valid inequalities for Pn. As an application, we describe a surprising relationship between (a) the parsimonious property of relaxations of the Symmetric Traveling Salesman Polytope and (b) a connectivity property of the ridge graph of the Graphical Traveling Salesman Polyhedron.