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Dear all, I'd like to announce the availability of the paper below. As usual,comments are welcome. Best regards, Davide Sangiorgi --------------------------- Title: On the origins of Bisimulation, Coinduction, and Fixed Points Url: http://www.cs.unibo.it/~sangio/DOC_public/history_bis_coind.pdf Author: Davide Sangiorgi Note: Technical Report 2007-24, Department of Computer Science, University of Bologna Abstract: The origins of bisimulation and bisimilarity are examined, in the three fields where they have been independently discovered: Computer Science, Philosophical Logic (precisely, Modal Logic), Set Theory. Bisimulation and bisimilarity are coinductive notions, and as such are intimately related to fixed points, in particular greatest fixed points. Therefore also the appearance of coinduction and fixed points are discussed, though in this case only within Computer Science. The paper ends with some historical remarks on the main fixed-point theorems (such as Knaster-Tarski) that underpin the fixed-point theory presented.