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.
    • CommentAuthorTobyBartels
    • CommentTimeAug 29th 2015

    It's really the reflection of topological spaces within a larger category, but usually people think of it as underlying: underlying topological space.

    • CommentRowNumber2.
    • CommentAuthorTodd_Trimble
    • CommentTimeAug 29th 2015

    Where you say ’point’ in the article, should there be some understanding that such points induce points of the frame 𝒪\mathcal{O}, i.e., there is an assigned function |X|hom Frame(𝒪,2){|X|} \to \hom_{Frame}(\mathcal{O}, \mathbf{2}) from points in the underlying set to frame maps?

    • CommentRowNumber3.
    • CommentAuthorTobyBartels
    • CommentTimeAug 29th 2015

    Right, that's supposed to be implied by the phrase ‘frame of open subsets’. That is, the frame is a subframe of the powerset of the set of points.

    • CommentRowNumber4.
    • CommentAuthorTodd_Trimble
    • CommentTimeAug 30th 2015

    Thanks. I went ahead and added that in.