Not signed in (Sign In)

Not signed in

Want to take part in these discussions? Sign in if you have an account, or apply for one below

  • Sign in using OpenID

Site Tag Cloud

2-category 2-category-theory abelian-categories adjoint algebra algebraic algebraic-geometry algebraic-topology analysis analytic-geometry arithmetic arithmetic-geometry book bundles calculus categorical categories category category-theory chern-weil-theory cohesion cohesive-homotopy-type-theory cohomology colimits combinatorics complex complex-geometry computable-mathematics computer-science constructive cosmology deformation-theory descent diagrams differential differential-cohomology differential-equations differential-geometry digraphs duality elliptic-cohomology enriched fibration foundation foundations functional-analysis functor gauge-theory gebra geometric-quantization geometry graph graphs gravity grothendieck group group-theory harmonic-analysis higher higher-algebra higher-category-theory higher-differential-geometry higher-geometry higher-lie-theory higher-topos-theory homological homological-algebra homotopy homotopy-theory homotopy-type-theory index-theory integration integration-theory k-theory lie-theory limits linear linear-algebra locale localization logic mathematics measure-theory modal modal-logic model model-category-theory monad monads monoidal monoidal-category-theory morphism motives motivic-cohomology nforum nlab noncommutative noncommutative-geometry number-theory of operads operator operator-algebra order-theory pages pasting philosophy physics pro-object probability probability-theory quantization quantum quantum-field quantum-field-theory quantum-mechanics quantum-physics quantum-theory question representation representation-theory riemannian-geometry scheme schemes set set-theory sheaf sheaves simplicial space spin-geometry stable-homotopy-theory stack string string-theory superalgebra supergeometry svg symplectic-geometry synthetic-differential-geometry terminology theory topology topos topos-theory tqft type type-theory universal variational-calculus

Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.

Welcome to nForum
If you want to take part in these discussions either sign in now (if you have an account), apply for one now (if you don't).
    • CommentRowNumber1.
    • CommentAuthordomenico_fiorenza
    • CommentTimeJan 5th 2010
    • (edited Jan 5th 2010)
    I've modified over quasi-categories in my personal area, upgrading from Hom-Sets to Hom-Spaces (i.e. infinity-categories of morphisms). This seems to simplify a lot the definition, and to make the connection with limits clearer. I'll wait for your comments before moving (in case they are positive) the version from my area to the main lab.

    two technical questions:

    i) how do i remove a page from my area (that's what I'd do after moving its content on the main lab)
    ii) there's a link to over quasi-categories on the page Domenico Fiorenza, but it seems not to work, and I am missing the problem with it
    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeJan 5th 2010
    • (edited Jan 5th 2010)

    Looks good to me. Thanks.

    Deleting of pages here follows the garbage-collection principle as in Java or the like: once a page is "orphaned" in that it has no links pointing to it, the system recognizes it as a candidate for deletion. The admins can push some button such as to remove all orphaned pages. I don't think we have ever done this so far, but that's the idea.

    So for practical purposes the upshot is: you don't delete a page, you just leave it where it is but discard all links to it. Since that's something you'd do anyway for a page meant to be deleted, really the upshot is: do nothing special to delete a page.

    • CommentRowNumber3.
    • CommentAuthorAndrew Stacey
    • CommentTimeJan 5th 2010

    Regarding the link: I think that that was the Dreaded Cache Bug. Your homepage was "cached" before the new page was created and the system didn't notice the update. I did a trivial modification to your page (corrected a couple of typos) which forced the page to be regenerated and that fixed the link.

    • CommentRowNumber4.
    • CommentAuthorAndrew Stacey
    • CommentTimeJan 5th 2010

    Regarding deleting pages: Urs, Toby, or I can delete all orphaned pages on a given web so if you want a page deleting on your personal web then just make a request here on the n-Forum (make it a new discussion - I certainly don't check every discussion on the n-Forum to check if there's something technical for me to do, I happened across this one by accident).

    • CommentRowNumber5.
    • CommentAuthorTobyBartels
    • CommentTimeJan 6th 2010

    One thing that you could do is to replace your personal web's page with

    < [[nlab:over quasi-category]]

    (Be sure to write out < like that in full, even though that sort of thing is not normally necessary, or you'll hit the Dreaded Missing First Line Bug.)

    That makes it look like other obsolete orphans (example: Oidification > history, begun in the days before redirects worked) and ensures that any links to your page (such as from this Forum) will continue to work, pointing people to where they want to go. It also preserves the history of your page for posterity, even if only you worked on it. Personally, I think that this is better than deleting it entirely.

    On the other hand, it's your personal web, so we can delete it entirely if that's what you want.