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 definitions 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 nlab noncommutative noncommutative-geometry number-theory object 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: 3x3 lemma

Bottom of Page

1 to 8 of 8

  1.  
    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeAug 24th 2012

    statement of the 3x3 lemma

    • CommentRowNumber2.
    • CommentAuthorMike Shulman
    • CommentTimeAug 24th 2012

    There’s also a 3x3 lemma for triangulated categories.

    • CommentRowNumber3.
    • CommentAuthorKeith Harbaugh
    • CommentTimeAug 2nd 2019

    Added link to Bourn’s 2003 paper “The denormalized 3×33\times3 lemma”, which extended the lemma, for rows and columns of (kernel relation/coequalizer) pairs, to many suitable UNPOINTED categories.

    diff, v12, current

    • CommentRowNumber4.
    • CommentAuthorKeith Harbaugh
    • CommentTimeAug 2nd 2019

    HELP! Embedded () pair within the doi of the last reference (and the most recent edit) conflicts with usage of () to denote the link. I have no idea of how to fix this problem.

    diff, v12, current

    • CommentRowNumber5.
    • CommentAuthorRichard Williamson
    • CommentTimeAug 2nd 2019
    • (edited Aug 2nd 2019)

    I’d suggest to use the HTML encoding of the brackets inside the link. They can be found here.

    • CommentRowNumber6.
    • CommentAuthorKeith Harbaugh
    • CommentTimeAug 2nd 2019

    Inserted HTML character codes for () within doi. Hope that fixes the problem. Thanks Robert Williamson!

    diff, v13, current

  7. My apologies, got my wires crossed, it is URL encoding that is needed in this case, I have fixed it now.

    • CommentRowNumber8.
    • CommentAuthorDavidRoberts
    • CommentTimeAug 4th 2019

    Moved doi link to (Bourn 2003) to it’s own anchor, spelling out the doi, rather than having it attached to the name of the paper, with the break in the link due to the MathJax rendering

    diff, v15, current

1 to 8 of 8

  1.