Abstract
When I met Da Ruan the first time in 1990, serving on his PhD committee, I was impressed by the quality and insight of his thesis and his argumentation. I did not expect, however, what a long and fruitful cooperation would follow. His PhD thesis focussed on a topic that was of basic importance to fuzzy inference and in which I was personally very interested. Very soon after this Da became an author of the leading international journal in the area of fuzzy sets, Fuzzy Sets and Systems, and very soon afterwards already an esteemed referee in Fuzzy Sets and Systems, and also for the European Journal for Operations Research, on whom I could always rely.
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© 2013 Springer-Verlag GmbH Berlin Heidelberg
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Zimmermann, HJ. (2013). Da Ruan in and with Aachen. In: Lu, J., Kerre, E. (eds) A Tribute to Prof. Dr. Da Ruan. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30307-4_53
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DOI: https://doi.org/10.1007/978-3-642-30307-4_53
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