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    • I added a note to the article on the subobject classifier: “In type theory, the type corresponding to the subobject classifier is typically called Prop.”

    • I started writing a bit more about FOLDS, and while I was at it I clarified the relationship between FOLDS' "simple categories]] and direct categories.

    • Attempt at making a page about defunctionalization. My first new page on nlab, I hope there are no faux pas’s. I noticed the resemblance to the adjoint functor theorem a while back, and several people seemed to find it interesting, so I thought I’d make a page.

      v1, current

    • Created stub for Spin group. Made a mess of explaining why it is so named.

      -David Roberts

    • a stub, am trying to bring into place some infrastructure for discussion of the finite subgroups of O(5)

      v1, current

    • starting a stub, for the moment just collecting references.

      Which finite subgroup of SO(4) corresponds to the 120-cell?

      v1, current

    • created stub for étale morphism of E-∞ rings in order to record the theorem of essential uniqueness of lifts of étale morphism from underlying commutative rings to E∞-rings (which is crucial for the characterization of the moduli stack of derived elliptic curves, and I have cross-linked with that). But otherwise no content yet, due to lack of leisure.

    • I added a proposition to this subsection which seems valid intuitionistically, but I wouldn’t mind a reality check from someone.

    • As a kind of supplement to Urs’s running topology series, I wrote an article colimits of normal spaces. Mainly I had wanted to write down a reasonably clean proof of the fact that CW-complexes are T4 spaces, in particular Hausdorff, as called for on the page CW-complexes are paracompact Hausdorff spaces, but working in slightly greater generality. There are a whole bunch of links to stick in, which I plan to get to.

      This page has taken me longer than I had first anticipated. Only after some struggle and reading around did I discover the power of the Tietze characterization of normality, which can be used to give a simple proof of the following general fact:

      If X,Y,Z are normal and if h:X→Z is a closed embedding and f:X→Y a continuous map, the attachment space = pushout W=Y∪XZ is also normal.

      This doesn’t seem so easy to prove with one’s bare hands (i.e., just using the usual definition of normality and reasoning away)!

      Urs, after recent discussion with Richard about paracompactness, where do matters stand on the page CW-complexes are paracompact Hausdorff spaces? It would be nice to tie up whatever loose ends are still left hanging there.

    • brief category:people-entry for hyperlinking references at quark, lepton and elsewhere

      v1, current

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

      v1, current

    • brief category:people-entry for hyperlinking references at quark and at QCD

      v1, current

    • Added the full statement of the theorem.

      Anonymous

      diff, v17, current

    • Fixed the existential quantifier in dictionary

      anqurvanillapy

      diff, v19, current

    • The way of writing the adjunction in locale in Prop 4. and Corollary 1. is a bit misleading: When you explicit the adjunction symbol you normally write the domain of the right adjoint on the left and its codomain on the right (e.g., as in reflective subcategory). I didn't do the change myself as I might be missing a convention here.

    • Added comment regarding propositional logic as that with no sorts.

      Steve Vickers

      diff, v13, current

    • created this in part to help answer query from Beppe here on the forum. It is very stubby and needs more work! (I copied and pasted from a preprint so it is not optimised for the Lab.)

      v1, current

    • am starting something. Nothing to be seen yet, but need to save for the moment

      v1, current

    • The former version redirected to basically to theory, where in the idea section the first link went right back to this entry.

      diff, v2, current

    • some minimum, for the moment just to make links work

      v1, current

    • Added a reference for this page, there have been some notes on cleaning it up left here too so I am uncovering it again.

      diff, v13, current

    • stub, to get some links into place

      v1, current

    • stub, for the moment just for the purpose of satisfying links

      v1, current

    • a minimum, for the moment just as to satisfy links

      v1, current

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

      v1, current

    • Added missing axiom. To see that an axiom like that is necessary, just observe that in the former formulation (without the first assumption) the requirements for meet and join were symmetric.

      diff, v25, current

    • added a little bit more text and pointers, to make this entry a little less stubby

      diff, v5, current

    • slightly expanded the Idea-section. But the entry remains a stub

      diff, v6, current

    • keep needing to point to this, so I finally gave it its own entry

      v1, current

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

      v1, current

    • Created, mainly with stuff from the overview.

      v1, current

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

      v1, current

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