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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeMar 24th 2010
    • (edited Mar 24th 2010)

    created reference-entry on David Roberts' thesis:

    and linked to it from Whitehead tower in an (infinity,1)-topos

    (David, I slightly edited your nLab-page, accordingly)

    • CommentRowNumber2.
    • CommentAuthorDavidRoberts
    • CommentTimeMar 24th 2010
    Thanks, Urs! I had a look at Whitehead tower in an (infinity,1)-topos and the sections I wrote and they are sketchy as. When I get some time I will tidy things up.
    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeMar 24th 2010
    • (edited Mar 24th 2010)

    When I get some time I will tidy things up.

    That would be nice! I was thinking about working on polishing these paragraphs, but seem to have run out of energy.

    You should emphasize that the ordinary pullback of the tangent n-groupoid is just one (useful) model of the homotopy pullback of the point. The homotopy pullback perspective gives the abstract concept, the pullback of the tangent n-groupoid a nice convenient concrete realization.

    Motivated by your remarks there, I want to add now somwehere a discussion of how the coskeleton operation on sSet models the notion of n-truncation of objects in the oo-topos  \infty Grpd . That'll be it for today then, for me.