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 internal-categories k-theory lie-theory limits linear linear-algebra locale localization logic mathematics measure measure-theory modal modal-logic model model-category-theory monad monads monoidal monoidal-category-theory morphism motives motivic-cohomology 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 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).

nLab > Latest Changes: 2-pullback

Bottom of Page

1 to 5 of 5

  1.  
    • CommentRowNumber1.
    • CommentAuthorTim_Porter
    • CommentTimeAug 22nd 2011

    Query from Stephen on 2-pullback.

    • CommentRowNumber2.
    • CommentAuthorTobyBartels
    • CommentTimeAug 22nd 2011

    Answered.

    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeNov 27th 2022
    • (edited Nov 27th 2022)

    hyperlinked the term strict iso-comma object

    also removed the obsolete query box (from #2, 11 years ago)

    diff, v20, current

    • CommentRowNumber4.
    • CommentAuthorUrs
    • CommentTimeNov 27th 2022

    looking at this entry now, I am doing a lot of polishing of the typesetting.

    also, I am replacing all “up to isomorphism” by “up to 2-isomorphism”

    here I have entirely deleted a second almost-copy of the square, which was redundant and seemed to have been a remnant of a copy-and-paste move

    I only now realized that all kinds of variants of “comma object” were redirects to this entry here. I have changed all these to instead point to comma object, but I am adding prominent pointer there back to here

    (I understand the logic that the iso-comma objects are equivalently pseudo-pullbacks, but it still seems the previous redirect structure was not helpful)

    diff, v20, current

  5. fixed a typo

    Anonymous

    diff, v21, current

1 to 5 of 5

  1.