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Kristijan Cafuta (kristijan.cafutafe.unilj.si) Abstract: The algebraic reformulation of the BMV conjecture is equivalent to a family of dimensionfree tracial inequalities involving positive semidefinite matrices. Sufficient conditions for these to hold in the form of algebraic identities involving polynomials in noncommuting variables have been given by Markus Schweighofer and the second author. Later the existence of these certificates has been settled for all but one case, which is resolved in this short note. Keywords: BessisMoussaVillani (BMV) conjecture, noncommutative polynomial, sum of hermitian squares, commutator, cyclic equivalence, semidefinite programming Category 1: Linear, Cone and Semidefinite Programming (Semidefinite Programming ) Category 2: Applications  Science and Engineering (Basic Sciences Applications ) Citation: K. Cafuta, I. Klep, and J. Povh. A note on the nonexistence of sum of squares certicates for the BessisMoussaVillani conjecture. J. math. phys., 51(8):083521, 10, 2010. Download: [Postscript][PDF] Entry Submitted: 10/27/2009 Modify/Update this entry  
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