Added information for 2024.

]]>Added link to Oberwolfach.

]]>Uploaded PDF scan of Category Theory 1991 front matter.

]]>@Bryce #45

Oh, I have that book. If he doesn’t get it to you, I can supply.

]]>To provide more context for comment 45, here is an (abridged) version of the email I received from Michael Johnson (I’m not sure if there is space in the nLab page to include any of this additional context):

- 1985 was Isle of Thorns (Sussex).
- 1986 was in Cambridge.
- In 1988 instead of a CT (not yet called that anyway), there was a Categorical Topology meeting in Prague.
- In 1993 there was a meeting at MSRI in Berkeley instead of a CT. It was joint with Universal Algebraists.
- In 1996 I recall that there was another Sussex meeting, and incidentally I put on the first Applied and Computational Category Theory meeting in Linz.
- In 1998 I’m pretty sure that there wasn’t a meeting.
- I don’t think that there was a meeting in 2001.
- In 2002 there was a meeting at the Fields Institute instead.
- In 2005 we held the “Streetfest” at Macquarie instead of a normal CT.
- In 2012 I’m pretty sure there wasn’t a CT, but there was a Coimbra meeting in honour of George Janelidze.

Added some more locations based on an email from Michael Johnson. He should also be sending me a scan of the front matter from *Proceedings of the 1991 Summer Category Theory Meeting*.

Added a YouTube playlist of talks from CT2023. So far only one talk has been added to the playlist, but they were recording most of the talks, so hopefully they will be added before too long.

]]>Added CT99 proceedings:

- {#CT99} J. Adamek, P.T. Johnstone and M. Sobral (Eds),
Category Theory 1999: selected papers, conference held in Coimbra in honour of the 90th birthday of Saunders Mac Lane, Journal of Pure and Applied Algebra168Issues 2–3 (2002) journal

For later inclusion: Category Theory and its Applications (Lawvere Festschrift) https://www.sciencedirect.com/journal/journal-of-pure-and-applied-algebra/vol/154/issue/1?

]]>Added link for abstracts for CT2023

]]>Added reference

- {#CT81} Klaus Heiner Kamps, Dieter Pumplün, Walter Tholen (Eds),
Category Theory: Applications to Algebra, Logic and Topology. Proceedings of the International Conference Held at Gummersbach, July 6-10, 1981, Lecture Notes in Mathematics962(1982) Springer–Verlag, doi:10.1007/BFb0066878

and missing anchors to proceedings, in the form `{#CTyy}`

Added references:

]]>

{#CT90} Aurelio Carboni, Maria Cristina Pedicchio, Guiseppe Rosolini (Eds),

Category Theory: Proceedings of the International Conference held in Como, Italy, July 22-28, 1990, Lecture Notes in Mathematics1488(1991) Springer–Verlag, doi:10.1007/BFb0084207{#CT91} R.A.G. Seely (Ed),

Category Theory 1991: Proceedings of the 1991 Summer Category Theory Meeting, Montreal, Canada, Conference Proceedings, Canadian Mathematical Society13(1992) American Mathematical Society/Canadian Mathematical Society AMS bookstore.

Added PDF list of conferences by sent by Peter Johnstone to David Roberts following an inquiry on the categories mailing list on 23 May 2023.

The list appears to be quite comprehensive, but I imagine it will still take some work to format it for the table on the nLab page.

]]>@BryceClarke: there are instructions here.

]]>Would someone be able to tell me how to upload a PDF to the nlab? Then I can upload the document from Johnstone on the history of CT (this will be quicker than inputing the information manually for the time-being).

]]>I’ve emailed Bryce the pdf document from Johnstone, as well as some other comments people have sent me privately about a little of the history esp. of the meta-level of the why’s of when conferences did not happen.

]]>@Todd

Yes, I vaguely thought that was the case.

]]>David: I’m not sure you know this, but Rota did research in and was pretty heavily invested in lattice theory, and was given to pronouncements like “”Never in the history of mathematics has a mathematical theory been the object of such vociferous vituperation as lattice theory.” An exaggeration of a type for which he is renowned. There’s a certain amount of defensiveness about lattice theory sprinkled throughout Indiscrete Thoughts.

]]>I find it amusing that Rota talks about lattice theory with equal weight as category theory. I know lattice theory was highly regarded at some point, but I don’t know if this import is still placed on it today.

]]>Well, “everyone” says it’s true, so it must be true.

The whole bit is hideously smug, except for the last sentence (though again there’s this “we”), which I find understandable.

]]>Oh, so you buy the assumption that there was “pretention to reduce all of mathematics to the language of categories” and are just wondering who was turned off by this? :-)

]]>I would have this one question for Rota: who is “we”?

]]>Added Gian-Carlo Rota quote, and a few other references, including the proceedings volumes published in TAC.

]]>That seems like a great quote to include on the page! (Seriously.)

The other reviews in the pdf page behind the link are similarly entertaining.

About a book on combinatorics it has to say:

]]>A specialized collection of specialized papers, stricly for specialists, in one of the most specialized specialities of that most special of all subjects

Re 26:

It appears the work doesn’t exist as a PDF online, but a table of contents could probably be extracted from Google Books (?).

As an aside, I found this amusing review of the volume:

- Gian-Carlo Rota,
*Book review of “Category Theory 1991”*, Advances in Mathematics, Vol. 102, No. 1, 1993, page 126. [doi:10.1006/aima.1993.1061]

]]>It is good to know that category theory is alive and well after all these years. We were turned off to category theory by the excesses of the sixties, when a small but loud crowd pretended to reduce all of mathematics to the language of categories. Now at least they have toned down their claims, and category theory has taken its modest place in the mathematical spectrum side by side with lattice theory, more pretentious perhaps than the latter, but with a good pedigree. We wish there were two versions of each of the papers presented at this conference: one for the specialist, as one finds it in this book, and one for the would-be specialist, who needs some direction and encouragement before he or she swallows this morass of definitions.