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It is with great sadness that we inform you of the passing of Loet.

Despite his unwavering determination to find solutions and his zest for life, he ultimately accepted with courage, that it was time to let go.

Loet passed away Saturday, 11 March, 2023, in Amsterdam.

MA Science & Technology Studies

Loet Leydesdorff

Communication and Innovation in the Dynamics of Science & Technology, University of Amsterdam
Amsterdam School of Communications Research (ASCoR) 

*  Publications 2000 -;  1970-2000 ; profile at Google Scholar

*  Software; Courseware; indicatorsmap of science

*  Amsterdam Colloquia of Science & Technology Dynamics (2006-2007)

*  Markets, Sciences and the Dynamics of Technological Change 

*  The Self-Organization of Knowledge-Based Communication: An introduction to Luhmann's social systems theory (second semester)

*  The Triple Helix of University-Industry-Government Relations

*  ZHAO Yong, GAO Sijia, and WU Yishan, Anatomy of Research Methods Used by a Famous Scientometrician Based on Coding  Frameworks, Journal of China Society for Scientific and Technical Information, 2017, 36(5): 443-451

*  De Volkskrant, Top 200

You are cordially invited to join the slow-read/discussion of The Evolutionary Dynamics of Discursive Knowledge, the latest book by Loet Leydesdorff.


This book is freely available both as .pdf and epub at  


Table of Contents

1.      Knowledge-Based Innovations and Social Coordination

2.      The Communication Turn in Philosophy of Science

3.      Scientific Communication and Codification

4.      Towards a Calculus of Redundancy

5.      Evolutionary and Institutional Triple Helix Models

6.      Regions, Innovations, and the North-South Divide in Italy

7.      The Measurement of Synergy

8.      Anticipation and the Dynamics of Expectations

9.      Subdynamics in Knowledge-Based Systems   

10.  Cultural and Biological Evolution

11.  Symmary and Conclusions

Table of Contents

  1. Scientometrics and Science Studies
  2. The Sociology of Scientific Knowledge
  3. The Intellectual Organization of the Sciences
  4. The Methodological Priority of Textual Data
  5. Full Text Analysis of Scientific Articles
  6. From Words and Co-Words to Information and Probabilistic Entropy
  7. The Static Model
  8. The Dynamics of Scientific Developments
  9. The Static and Dynamic Analysis of Networks 
  10. Irreversibilities in Networks
  11. EU Policies and Transnational Publications 
  12. Knowledge Representations, Bayesian Inferences, and Empirical Science Studies
  13. A Mathematical Theory of Scientific Communications

Table of Contents

  1. Introduction
  2. Towards a Sociological Theory of Communication 
  3. The evolution of communication networks 
  4. The non-linear dynamics of sociological reflections 
  5. New perspectives on empirical theories 
  6. A triple helix of university-industry-government relations (includes a theory of citation)
  7. The European information society 
  8. Regime changes and sustainable development 
  9. Uncertainty and the communication of 'time' 
  10. The expectation of social change

Table of Contents

1.     The Knowledge-Based Economy

2.     Knowledge, Information, and the Globalization of the Knowledge Base

3.     The Processing of Meaning in Anticipatory Systems

4.     Codification and Differentiation of Meaning in Social Systems

5.     The Transformation of Organization and Agency

6.     Reflexive Globalization and the Knowledge-Based Order

7.     The historical evolution of the Triple Helix

8.     The Measurement of the Knowledge Base
using the Triple Helix Model

9.     The Measurement of the Knowledge Base of the Dutch Economy

10.   The Knowledge Base of the German Economy

11.   Summary and Conclusions: The philosophical foundation of the knowledge base in Husserl�s Cogitatum

Triple Helix

Triple Helix Association


  Triple Helix XIII: Tsinghua, Beijing, 21-23 August 2015;

  Triple Helix XII: Tomsk, Russia, 11-13 September 2014;

  Triple Helix XI: London, UK, 7-10 July 2013;

  Triple Helix X: Bandung Institute of Technology, Indonesia, 8-10 August 2012; Proceedings papers

  Triple Helix IX: Stanford University, 11-14 July 2011; Proceedings papers

  Triple Helix IIX: Madrid, 20-22 October 2010; Abstract Book and Proceedings

  Triple Helix VII: Glasgow, 17-19 June 2009

  Triple Helix VI: Singapore, 16-19 May 2007

  Triple Helix V: Turin/Milan, 18-21 May 2005

  Triple Helix IV: Breaking Boundaries � Building Bridges (Copenhagen, 2002). One can download the papers from the Copenhagen meeting here as zip-file (appr. 10 Mbyte)

  The Endless Transition: Relations among Social, Economic, and Scientific Developments (Rio de Janeiro, 2000)

  The Future Location of Research in University-Industry-Government Relations (New York, 1998) 

  University-Industry-Government Relations (Amsterdam, 1996)

  dedicated email list (subscribe, unsubscribe, and archive)


           (cv) (short bio)

Science & Technology Dynamics, University of Amsterdam 
Amsterdam School of Communications Research (ASCoR) 
Postbus 15793 
1001 NG  Amsterdam 
The Netherlands 

Tel.: +31-6 2373 8730 
Fax : +31-842 239 111 
e-mail: loet@leydesdorff.net

ORCID: http://orcid.org/0000-0002-7835-3098;

Author ID (Scopus): 7003954276

ResearchID (WoS): www.researcherid.com/rid/E-903-2010

Google profile at https://scholar.google.com/citations?user=ych9gNYAAAAJ&hl=en