The Fourteenth Workshop on
Numerical Ranges and Numerical Radii

Technical University of Munich .
"Max-Planck-Inst. for Quantum Optics, MPQ"
June 13-18, 2018.


The year 2018 is the 100 anniversary of the celebrated Toplitz-Hausdorff Theorem asserting the numerical range of an operator is always convex. There has been a lot of research activities on the topic after this fundamental result was established. The high level of research activities are due to the many connections of the subject to different pure and applied areas. The purpose of the workshop is to stimulate research and foster interaction of researchers interested in the subject. The informal workshop atmosphere will facilitate the exchange of ideas from different research areas and, hopefully, the participants will leave informed of the latest developments and newest ideas. One may visit the website WONRA to see some background about the subject and previous meetings, and also the Wiki page for the history of the workshop and related meetings on the subject. Furthermore, to celebrate the 100 anniversary of the Toplitz-Hausdorff Theorem, there will be a special workshop in the summer of 2019 held in Japan (Kyoto/Osaka area), and the 2020 workshop following the usual schedule will take place in Coimbra in the summer of 2020.


Wokshop photos

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Schedule, Title and Abstracts




Travel and transportation

Confirmed participants

  • Martin Argerami, University of Regina.
  • Aleksandra Badowska, New York University Abu Dhabi (NYUAD).
  • Catalin Badea, University of Lille.
  • Natalia Bebiano, Unviersity of Coimbra.
  • Janko Bracic, University of Ljubljana, Slovenia janko.bracic at
  • Mao-Ting Chien, Soochow Unviersity.
  • Man-Duen Choi, University Toronto.
  • Michel Cruzeix, University of Rennes.
  • Cristina Diogo, Instituto Universitario de Lisboa, Portugal. cristina.diogo at
  • Doug Farenick, University of Regina. (organizer)
  • Luyining (Elaine) Gan, Auburn University,
  • Titas Geryba, NYU Abu Dhabi
  • David Gross, Technical University Munich.
  • Thomas Huckle, Technical University Munich.
  • Daniel Kressner,Technical University Munich.
  • Pan-Shun Lau, Hong Kong Polytechnic University.
  • Chi-Kwong Li, College of William and Mary. (organizer)
  • Nischal Mainali, NYU Abu Dhabi
  • Hiroshi Nakazato, Hirosaki University.
  • Hiroyuki Osaka, Ritsumeikan University.
  • Panayiotis Psarrakos, National Technical University of Athens
  • Ed. Poon, Embry-Riddle Aeronautical University
  • Norbert Schuch, Technical University Munich.
  • Thomas Schulte-Herbruggen, Technical University Munich.
  • Ilya Spitkovsky, NYUAD.
  • Nung-Sing Sze, Hong Kong Polytechnic University.
  • Konrad Szymanski, Marian Smoluchowski Institute of Physics, Jagiellonian University
  • Tin-Yau Tam, Auburn University.
  • Fatemeh Esmaeili Taheri, University of Coimbra.
  • Frederik vom Ende, Technical University Munich.
  • Stephan Weis, Universite libre de Bruxelles
  • Michael Wolf, Technical University Munich.
  • Wei-Ru Xu, East China Normal University.
  • Karol Zyczkowski, Jagiellonian University.