Workshop on Numerical Ranges and Numerical Radii (WONRA) is a biennial workshop series on numerical ranges and numerical radii which began in 1992. About Numerical ranges and numerical radii are useful in the study of matrix and operator theory. These topics have applications in many subjects in pure and applied mathematics, such as quadratic forms, Banach spaces, dilation theory, control theory, numerical analysis, quantum information science.
History In the early 1970s, numerical range workshops were organized by Frank Bonsall and John Duncan. More activities were started in early 1990s, including the biennial workshop series, which began in 1992, and special issues devoted to this workshop were published.
Workshops # Year Location Organizer(s) Participation Workshop photo 1 1992 Williamsburg, VA, USA C. Johnson, C.K. Li 33Photo 2 1994 Coimbra, Portugal, N. Bebiano 36Photo 3 1996 Sapporo, Hokkaido, Japan T. Ando and K. Okubo 36Photo 4 1998 Madison, WI, USA R. Brualdi, C.K. Li 30Photo 5 2000 Nafplio, Greece J. Maroulas, M. Tsatsomeros 29 Photo 6 2002 Auburn, AL, USA C.K. Li, T.Y. Tam 30 Photo 7 2004 Coimbra, Portugal N. Bebiano, R. Lemos, G. Soares 40 Photo 8 2006 Bremen, Germany C.K. Li, L. Rodman, C. Tretter 39 Photo 9 2008 Williamsburg, VA, USA C.K. Li 29 Photo 10 2010 Krakow, Poland C.K. Li, F.H. Szafraniec, J. Zemanek 40 Photo 11 2012 Kaohsiung, Taiwan C.K. Li, N.C. Wong 48 Photo 12 2014 Sanya, China S.Y. Cheng, M.D. Choi, C.K. Li 43 Photo 13 2016 Taipei, Taiwan M.T. Chien, C.K. Li 29 Photo 14 2018 Munich, Germany D.Farenick, D.Kribs, C.K.Li, S. Plosker, T. Schulte-Herbruggen 32 Photo 15 2019 Kawagoe, Japan C.K. Li, H. Nakazato, H. Osaka, T. Yamazaki 38 Photo 16 2023 Coimbra, Portugal N. Bebiano, R. Lemos, A. Nata, G. Soares 25 Photo 17 2025 Taichung, Taiwan R.K. Lee, C.K. Li, N.S. Sze, M.C. Tsai, Y.S. Wang, N.C. Wong 50Photo
Symposium in conferences Year Location Conferences Organizer(s) 1991 Minneapolis, USA Fourth SIAM Conference on Applied Linear Algebra C.K. Li 2007 Shanghai, China International Linear Algebra Society Conference C.K. Li
References
External links WONRA 2004 – Coimbra, Portugal WONRA 2008 – Williamsburg, VA, USA WONRA 2010 – Krakow, Poland WONRA 2012 – Kaohsiung, Taiwan WONRA 2014 – Sanya, China WONRA 2016 – Taipei, Taiwan WONRA 2018 – Munich, Germany WONRA 2019 - Kawagoe, Japan WONRA 2023 – Coimbra, Portugal WONRA 2025 - Taichung, Taiwan