Geodesic
Semidefinite Relaxations of The Traveling Salesman Problem
Yugoslav journal of operations research, Tome 9 (1999) no. 2, p. 157 .

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We apply semidefinite programming to the symmetric traveIing salesman problem (TSP). The TSP is modeled as a problem of discrete semidefinite programming. In order to estimate the optimal objective value, a class of semidefinite relaxations of the TSP model is defined. Experimental results with randomly generated examples show that the proposed relaxation gives considerably better bounds than 2-matching and 1-tree relaxation.
Classification : 90C27 90C22
Keywords: Semidefinite programming, combinatorial optimization , traveling salesman problem, 
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     author = {Drago\v{s} Cvetkovi\'c and Mirjana \v{C}angalovi\'c and Vera Kova\v{c}evi\'c-Vuj\v{c}i\'c},
     title = {Semidefinite {Relaxations} of {The} {Traveling} {Salesman} {Problem}},
     journal = {Yugoslav journal of operations research},
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Dragoš Cvetković; Mirjana Čangalović; Vera Kovačević-Vujčić. Semidefinite Relaxations of The Traveling Salesman Problem. Yugoslav journal of operations research, Tome 9 (1999) no. 2, p. 157 . http://geodesic.mathdoc.fr/item/YJOR_1999_9_2_a0/