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The Computer Journal Advance Access first published online on June 5, 2009
This version published online on July 11, 2009
The Computer Journal, doi:10.1093/comjnl/bxp052
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© The Author 2009. Published by Oxford University Press on behalf of The British Computer Society. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Events, Causality and Symmetry

Glynn Winskel*

Computer Laboratory, University of Cambridge, William Gates Building, JJ Thomson Avenue, Cambridge CB3 0FD, UK

* Corresponding author: Glynn.Winskel{at}cl.cam.ac.uk

Received 31 October 2008; revised 28 April 2009

The article discusses causal models, such as Petri nets and event structures, how they have been rediscovered in a wide variety of recent applications and why they are fundamental to computer science. A discussion of their present limitations leads to their extension with symmetry. The consequences, actual and potential, are discussed.

Key Words: Petri nets • events structures • symmetry • unfolding • spans • profunctors • domain theory • concurrency

Handling editor: Vladimiro Sassone


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