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    • started an entry on the Borel construction, indicating its relation to the nerve of the action groupoid.

    • Added the analogous sheaf condition in terms of covering families

      diff, v20, current

    • need to record some results on equivariant tubular neighbourhoods etc. Didn’t know where to put these, so I thought we’d need a dedicated entry on equivariant differential topology.

      v1, current

    • the minimum definition and some plain cross-links (we didn’t have this elsewhere, or do we?)

      v1, current

    • I have added pointer to the second of Postnikov’s original articles on the matter:

      • M. M. Postnikov, Issledovaniya po gomotopičeskoĭ teorii nepreryvnyh otobraženiĭ. I. Algebraičeskaya teoriya sistem. II. Naturalʹnaya sistema i gomotopičeskiĭ tip. (Russian) [[_Investigations in homotopy theory of continuous mappings. I. The algebraic theory of systems. II. The natural system and homotopy type._]] Trudy Mat. Inst. Steklov. no. 46. Izdat. Akad. Nauk SSSR, Moscow, 1955. (mathnet:tm1182)

      Is there any linkable online trace of Postnikov’s first article:

      • M. M. Postnikov, Determination of the homology groups of a space by means of the homotopy invariants, Doklady Akad. Nauk SSSR (N.S.) 76: 359–362 (1951)


      diff, v53, current

    • starting something. Not done yet but need to save

      v1, current

    • started some minimum at exceptional field theory (the formulation of 11d supergravity that makes the exceptional U-duality symmetry manifest)

    • added to conservative functor the proposition saying that pullback along strong epis is a conservative functor (if strong epis pull back).

      How about the \infty-version?

    • am finally giving this an entry

      v1, current

    • a category:reference-page to ease cross-linking

      v1, current

    • i polished the definition in bundle gerbe and then reorganized the former material on “Interpretations” in a new section

      that first shows how to get a shifted central extension of groupoids form the bundle gerbe, and then demonstrates that this is the total space of a principal 2-bundle

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

      v1, current