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    • Page created, but author did not leave any comments.

      v1, current

    • added pointer, here and in related entries, to

      being one of the early references considering the computation of black hole radiation in terms of thermal field theory on Wick-rotated spacetimes with compact/periodic “Euclidean time”.

      diff, v22, current

    • tried to edit Ext a bit. But this needs to be expanded, eventually.

    • starting something, but am being interrupted now. Am saving anyway to make the link work

      v1, current

    • I tried to structure the entry Heyting algebra a bit more. Check if you like it.

      I also added a little bit to the Examples-section.

      In the section on toposes it says that a “Grothendieck (0,1)-topos” is a locale. Is that correct? Shouldn’t it say: a Grothendieck (0,1)-topos is a category of open subsets of a topological space?

    • I added a note about what “projectively flat” means in the context of parabolic Cartan geometry. I would assume that this should mean the same thing as “a connection which is flat up to central term” as described in the first sentence?

      diff, v2, current

    • That doesn’t look right at Via left homotopy of spectra. ℓ\ell is supposed to be the forgetful functor from spectra to prespectra.

      But what kind of spectra are we looking at? It seems to be coordinate-free spectrum. So then we need a definition of prespectrum.

    • Earlier today I was checking where on the nnLab we had recorded basics on finite homotopy (co)limits of spectra. But it seems we haven’t at all, except for the discussion at Introduction to Stable homotopy theory.

      So then I started to add something at Spectra, only to notice that this needs harmonizing/merging with the parallel entry stable (infinity,1)-category of spectra.

      To cut this Gordian knot, I am now creating hereby an entry with a bare section on finite homotopy (co)limits of spectra, to be !includeed into these entries (and into stable homotopy category and maybe elsewhere, too).

      So far I have just some bare minimum here. Deserves to be expanded.

      v1, current

    • I am in the process of preparing a piece on Hochschild cohomology

      while the Lab is down, I'll abuse the forum here for posting my source. Probably not well suited for reading it, but just so the effort is not wasted should my notebook get run over by a bus. That could happen, as the buses here in Sheffield go on the wrong side of the road.

      See followup comment...

    • am giving this its own little entry (in line with Spin(2), Spin(3), Spin(4), Spin(5)). For the moment just as to record a nice reference for the exceptional iso Spin(6)≃SU(4)Spin(6) \simeq SU(4)

      v1, current

    • A bare reference item. For the moment just as an experiment, to go with the discussion here.

      v1, current

    • pure morphism (much more to be said, and more references, but no time now)

    • I strongly disagree with the statement in Grothendieck category that the Grothendieck category is small. The main examples like RMod{}_R Mod are not! What did the writer of that line have in mind ?

    • Since I gathered them for my recent talk, I may as well provide a list here of work in this area. I need to add names, etc.

      v1, current

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