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).
    • CommentRowNumber1.
    • CommentAuthorTim_Porter
    • CommentTimeJan 15th 2013

    Just a comment, I mostly have seen k-invariant, with a lower case k. Does anyone have ‘strong’ feelings about this?

    • CommentRowNumber2.
    • CommentAuthorTodd_Trimble
    • CommentTimeJan 15th 2013

    My tuppence worth: if this is the cohomology class k-invariant, I’ve only seen it lower case, and I’d regard it as a mistake to use upper case.

    • CommentRowNumber3.
    • CommentAuthorjim_stasheff
    • CommentTimeJan 15th 2013
    Agreed
    • CommentRowNumber4.
    • CommentAuthorDavidRoberts
    • CommentTimeJan 15th 2013

    I do, and I mentioned it to Urs in person :-)

    • CommentRowNumber5.
    • CommentAuthorTodd_Trimble
    • CommentTimeJan 15th 2013

    You do what? Have strong feelings? Agree should be lower case?

    • CommentRowNumber6.
    • CommentAuthorDavidRoberts
    • CommentTimeJan 15th 2013

    I do think it should lower case, though perhaps ’strong’ feelings is overstating it. I’ve never seen the capital used and it just looks wrong.

    • CommentRowNumber7.
    • CommentAuthorTim_Porter
    • CommentTimeJan 15th 2013

    Urs has changed it.

    • CommentRowNumber8.
    • CommentAuthorUrs
    • CommentTimeJan 15th 2013
    • (edited Jan 15th 2013)

    had changed it, before you all noticed (or before I noticed that you noticed).

    Maybe in the future don't invest a whole lot of energy into worrying about an un-unnounced entry that is obviously still in the making. I may fire off a whole bunch of stubs when working on something else just as to have the link structure established right away. Since there are other tasks in life besides editing the nLab, I cannot guarantee that every entry is meant to be publically seen the moment you see it appear on the "recently revised" list. It is meant to be seen the moment that I announce its creation here.

    On the other hand, if you do see a new entry appear with an evident uncontroversial typo, say referring to something standard in all textbooks, then by all means, please just fix it. We don't need to have long discussion about standard facts that the traditional textbook literature has long settled. I think. Especially if it's all about conventions of terminology and not about anything substantial. It saves us all quite a few keystrokes.

    • CommentRowNumber9.
    • CommentAuthorTodd_Trimble
    • CommentTimeJan 15th 2013

    Dear Urs: both your irritation and your proposal make a certain amount of sense (although maybe Tim wasn’t absolutely sure and was just checking). As for myself, I was just responding to the question, without knowing where it was coming from.

    I think I might feel similarly if I were in your shoes. (Also, I saw your response at the “light” thread before this, which helps to contextualize your remark at the light thread.)

    • CommentRowNumber10.
    • CommentAuthorTim_Porter
    • CommentTimeJan 16th 2013
    • (edited Jan 16th 2013)

    To quote Todd: although maybe Tim wasn’t absolutely sure and was just checking<- 100% correct. There may be sometimes very good reasons for a small change in notation, so this leads to a hesitation on behalf of the reader (in this case me). Because of that the two actions that seem appropriate in such a case are (i) include the old notation as well or (ii) check that it was intended and not a typo, then act. The second seemed safer. This avoids a large expense of energy on anyones behalf.

    For the ’and was just checking’, I seem to remember that I was wanting to see if I was using an old fashioned term in something. In a monograph that I am writing I like to have a fairly standard cross reference to terminology and notation, (so as to stay fairly ‘fashionable’) and I often use the n-Lab just for that whilst writing. :-)

    I am not a traditionalist when it comes to terminology, but neither am I an anti-traditionalist. Changes will often be worth making (or at least trying out) to standard but ill conceived terminology, for instance the fashion for the use of ’space’ as meaning ’simplicial set’ (without any comment at the start of a published article). This leads to lots of difficulties in what I am writing.