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Mathematics of Computation

Published by the American Mathematical Society since 1960 (published as Mathematical Tables and other Aids to Computation 1943-1959), Mathematics of Computation is devoted to research articles of the highest quality in computational mathematics.

ISSN 1088-6842 (online) ISSN 0025-5718 (print)

The 2020 MCQ for Mathematics of Computation is 1.78.

What is MCQ? The Mathematical Citation Quotient (MCQ) measures journal impact by looking at citations over a five-year period. Subscribers to MathSciNet may click through for more detailed information.

 

Spectral norm of a symmetric tensor and its computation
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by Shmuel Friedland and Li Wang HTML | PDF
Math. Comp. 89 (2020), 2175-2215 Request permission

Abstract:

We show that the spectral norm of a $d$-mode real or complex symmetric tensor in $n$ variables can be computed by finding the fixed points of the corresponding polynomial map. For a generic complex symmetric tensor the number of fixed points is finite, and we give upper and lower bounds for the number of fixed points. For $n=2$ we show that these fixed points are the roots of a corresponding univariate polynomial of degree at most $(d-1)^2+1$, except certain cases, which are completely analyzed. In particular, for $n=2$ the spectral norm of $d$-symmetric tensor is polynomially computable in $d$ with a given relative precision. For a fixed $n>2$ we show that the spectral norm of a $d$-mode symmetric tensor is polynomially computable in $d$ with a given relative precision with respect to the Hilbert-Schmidt norm of the tensor. These results show that the geometric measure of entanglement of $d$-mode symmetric qunits on $\mathbb {C}^n$ are polynomially computable for a fixed $n$.
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Additional Information
  • Shmuel Friedland
  • Affiliation: Department of Mathematics, Statistics and Computer Science, University of Illinois, 851 South Morgan Street, Chicago, Illinois 60607-7045
  • MR Author ID: 69405
  • Email: friedlan@uic.edu
  • Li Wang
  • Affiliation: Department of Mathematics, University of Texas at Arlington, 411 S. Nedderman Drive, 478 Pickard Hall, Arlington, Texas 76019-0408
  • Email: li.wang@uta.edu
  • Received by editor(s): August 15, 2018
  • Received by editor(s) in revised form: August 17, 2018, February 6, 2019, August 1, 2019, and January 12, 2020
  • Published electronically: May 15, 2020
  • © Copyright 2020 American Mathematical Society
  • Journal: Math. Comp. 89 (2020), 2175-2215
  • MSC (2010): Primary 13P15, 15A69, 65H04, 81P40
  • DOI: https://doi.org/10.1090/mcom/3525
  • MathSciNet review: 4109564