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Philippe Gaucher

Postal address

Université de Paris Cité
Bâtiment Sophie Germain
Case 7014
75205 Paris Cedex 13




Bâtiment Sophie Germain
8 place Aurélie Nemours
75013 PARIS


Presentation: My work is about Directed Algebraic Topology, which is at the interface between the geometric models of concurrency (some of them topological, other ones combinatorial) and algebraic topology (CV in English). The main geometric models I am interested in are several variants of Grandis' $d$-spaces (multipointed or not), trace spaces giving rise to semicategorical variants called flows, Moore variants or these notions, and several improvements of the notion of precubical set (non-symmetric and symmetric tranverse set, partial precubical set).

Keywords: homotopy, category, topology, combinatorics, concurrency.

Warnings: I do not work on higher category theory just because I don't need this theory. I did use strict globular and strict cubical higher dimensional categories in the past: that was a deadend for my work. The understanding of the link between the two geometric models of concurrency which are the multipointed d-spaces and the flows does not require either to use some weak version of the notion of topologically enriched semicategory (unlike what I thought for several years). Instead, it is a Moore version of the notion of topologically enriched semicategory which is required (the so-called Moore flows introduced in PDF, and explored further in PDF, PDF and PDF). I do not work on homotopy type theory (HoTT) either.

Artificial Intelligence: Given all the nonsense one reads in the newspapers about AI, I feel obliged to state my point of view here. In French, I recommend the reading of the book "Le mythe de la singularité. Faut-il craindre l’intelligence artificielle ?" by Jean-Gabriel Ganascia. I don't know whether this book is translated in English. The book deconstructs the myth of the technological singularity, which is the day when a supposed general artificial intelligence will appear. Artificial Intelligence does not exist. It is simply a new programming tool. As far as generative AI is concerned, it simply produces probable sequences of words and symbols without really understanding what it's talking about. We talk about stochastic parrot. Sometimes this leads to interesting things, sometimes to nonsense.




Other activities

I do not work in any way for Elsevier, Springer, John Wiley & Sons and Informa. I also signed the petition The Cost of Knowledge against Elsevier. In particular, this means that I do not attend any conference where people are forced to publish in such a journal. I do not write any review for a paper submitted to these journals. I do not submit any paper in these journals either. The scientific papers are financed by our salaries (the salaries of the authors, of the editors finding reviewers, and of the anonymous reviewers writing reports), and therefore by the taxpayers who therefore must have access to the papers at a reasonable cost, and if possible for free. The scientific knowledge does not belong to private investors making money with it and who do not even finance research in any way. It does not cost much to maintain a website. In fact, it is astonishing how slow and poorly designed the websites of some very expensive scientific journals are, which moreover display stupidities like the hit parade of most-read papers, as if one was listening to a radio station ranking hits. This reflects a false conception of science, which is unfortunately echoed by many politicians who believe that science is a matter of competition, when in fact it is a matter of collaboration.


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