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Mathematics

D-Index
42
Citations
7010
World Ranking
1797
National Ranking
769

Research.com Recognitions

  • 2013 - Fellow of the American Mathematical Society

Overview

J. William Helton is affiliated with the University of California, San Diego in the United States. Their research spans multiple fields, with significant contributions in computer science and mathematics.

The primary areas of study for Helton include computational theory and mathematics, artificial intelligence, algebra and number theory, mathematical physics, and applied mathematics. Their work covers a range of topics such as quantum computing algorithms and architecture, advanced topics in algebra, matrix theory and algorithms, computability and logic related to AI algorithms, polynomial and algebraic computation, advanced operator algebra research, and quantum information and cryptography.

Helton has published extensively, with papers appearing in several notable venues. Frequent publication outlets include arXiv (Cornell University), Annales Henri Poincaré, Journal of Functional Analysis, International Mathematics Research Notices, and Quantum.

Notable papers by Helton include:

  • Bianalytic free maps between spectrahedra and spectraballs, 2020, Journal of Functional Analysis
  • Synchronous Values of Games, 2024, Annales Henri Poincaré
  • Factorization of Noncommutative Polynomials and Nullstellensätze for the Free Algebra, 2020, International Mathematics Research Notices

Helton has collaborated with several researchers over their career. Frequent coauthors include Igor Klep, Adam Bene Watts, Aidan Epperly, Eric Evert, and Jurij Volčič.

Their work also intersects with the contributions of Adam Bene Watts, who has coauthored papers such as "Noncommutative Nullstellensätze and Perfect Games" (2023, Annales Henri Poincaré) and "Relaxations and Exact Solutions to Quantum Max Cut via the Algebraic Structure of Swap Operators" (2024, Quantum), which are related by research themes.

Helton was recognized as a Fellow of the American Mathematical Society in 2013.

Best Publications

  • Linear matrix inequality representation of sets

    J. William Helton;Victor Vinnikov

  • H ∞ -optimal feedback controllers for linear multivariable systems

    B. Francis;J. Helton;G. Zames

  • Extending H-infinity Control to Nonlinear Systems: Control of Nonlinear Systems to Achieve Performance Objectives

    J. William Helton;Matthew R. James

  • “Positive” noncommutative polynomials are sums of squares

    J. William Helton

  • Semidefinite representation of convex sets

    J. William Helton;Jiawang Nie

  • NONCOMMUTATIVE CONVEXITY ARISES FROM LINEAR MATRIX INEQUALITIES.

    J. William Helton;Scott A. McCullough;Victor Vinnikov

  • Discrete time systems, operator models, and scattering theory

    J.William Helton

  • Every convex free basic semi-algebraic set has an LMI representation

    J. William Helton;Scott McCullough

  • Classical control using H∞ methods: theory, optimization, and design

    J. William Helton;Orlando Merino

  • Interpolation problems of Pick-Nevanlinna and Loewner types for meromorphic matrix functions: Parametrization of the set of all solutions

    Joseph A. Ball;J. William Helton

  • Traces of commutators of integral operators

    J. William Helton;Roger E. Howe

  • Sufficient and Necessary Conditions for Semidefinite Representability of Convex Hulls and Sets

    J. William Helton;Jiawang Nie

  • The matricial relaxation of a linear matrix inequality

    J. William Helton;Igor Klep;Igor Klep;Scott A. McCullough

  • Non-Euclidean functional analysis and electronics

    J. William Helton

  • Operator-valued Semicircular Elements: Solving A Quadratic Matrix Equation with Positivity Constraints

    J. William Helton;Reza Rashidi Far;Roland Speicher

  • Systems with infinite-dimensional state space: The Hilbert space approach

    Unknown

  • Worst case analysis in the frequency domain: The H ∞ approach to control

    Unknown

  • Proper analytic free maps

    J. William Helton;Igor Klep;Igor Klep;Scott McCullough

  • Integral operators: Traces, index, and homology

    J. William Helton;Roger E. Howe

  • Applications of realizations (aka linearizations) to free probability

    J. William Helton;Tobias Mai;Roland Speicher

  • POSITIVE POLYNOMIALS IN SCALAR AND MATRIX VARIABLES, THE SPECTRAL THEOREM AND OPTIMIZATION

    J. William Helton;Mihai Putinar;Tibi Constantinescu

  • The convex Positivstellensatz in a free algebra

    J. William Helton;Igor Klep;Scott McCullough

  • An introduction to design

    J. William Helton;Orlando Merino

Frequent Co-Authors

Joseph A. Ball
Joseph A. Ball Virginia Tech
Mihai Putinar
Mihai Putinar University of California, Santa Barbara
Roland Speicher
Roland Speicher Saarland University
Matthew R. James
Matthew R. James Australian National University
Roger Howe
Roger Howe Texas A&M University
Ciprian Foias
Ciprian Foias Texas A&M University
Allen Tannenbaum
Allen Tannenbaum Stony Brook University
Robert E. Skelton
Robert E. Skelton Texas A&M University
Pramod P. Khargonekar
Pramod P. Khargonekar University of California, Irvine
Bruce A. Francis
Bruce A. Francis University of Toronto

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