You're reading the public-facing archive of the Category Theory Zulip server.
To join the server you need an invite. Anybody can get an invite by contacting Matteo Capucci at name dot surname at gmail dot com.
For all things related to this archive refer to the same person.
Tim Hosgood (Aug 05 2021 at 14:48):today at 17:00 UTC
Abstract:
This talk will summarize some aspects of recent work with John Baez and Joe Moeller, which aims to tie together representations of symmetric groups, Schur functors, and lambda rings from the point of view of 2-rigs, which are a categorification of ordinary 'rigs' or rings without negatives. A common theme in this area is the notion of 'plethory'. We sketch how the archetypal plethory of lambda rings arises simply and naturally from the simplest possible '2-plethory', and applying decategorification to it.
YouTube: https://www.youtube.com/watch?v=VmtUi2eiNdI
Zoom: https://topos-institute.zoom.us/j/5344862882
Simon Burton (Aug 05 2021 at 18:18):Um, a bit more than one hour notice for this talk would have been nice.
Evan Patterson (Aug 05 2021 at 18:20):Tim's post here is a courtesy but there are several calendars where the talks are posted far in advance.
Tim Hosgood (Aug 05 2021 at 19:19):sorry, there was a bit of a delay in getting the title and abstract from the speaker, so the mailing list email only went out yesterday, and i completely forgot about zulip!
John Baez (Aug 05 2021 at 21:17):These calendars are a bit hard to find, but here's one:
https://teamup.com/ksfss6k4j1bxc8vztb
John Baez (Aug 05 2021 at 21:19):Or, you can go to researchseminars.org, which has a massive list of seminars, and do a search. For example, searching under "topos" gives the Topos Institute seminars:
https://researchseminars.org/?keywords=topos
John Baez (Aug 05 2021 at 21:22):You can also do a search under subjects (maybe only if you log in?) and then see all seminars with topic "category theory"... but I can't link to that search.
Tim Hosgood (Aug 05 2021 at 21:47):(also the timetable for this specific colloquium is on the webpage, along with a nice countdown timer to help alleviate time zone based confusion :smile:)