Equivariant subobject-classifier conjecture for the contextuality topos

Let cmathcalV(cmathcalH)cmathcal{V}(cmathcal{H}) be the poset of contexts of the Hilbert space cmathcalHcmathcal{H}, let cmathcalVf(cmathcalH)cmathcal{V}_f(cmathcal{H}) denote the corresponding context category with the group action forgotten, and let FF be the functor relating the associated sheaf topoi. Write ΩcmathcalV(cmathcalH)\underline{\Omega}^{cmathcal{V}(cmathcal{H})} for the subobject classifier and G/GF\underline{G/G_F} for the corresponding constant equivariant object. Equivariant subobject-classifier conjecture. There is an isomorphism

F(ΩV(H))G/GF×ΩV(H).F(\underline{\Omega}^{\mathcal{V}(\mathcal{H})})\simeq\underline{G/G_F}\times\underline{\Omega}^{\mathcal{V}(\mathcal{H})}.

The claim identifies the image of the subobject classifier under FF with the product of the orbit object and the original subobject classifier; the source immediately supplies a proof, so this candidate is solved rather than open.

Sources & referencesView supporting material

Primary source

Cecilia Flori, “Lectures on Topos Quantum Theory”, arXiv:1207.1744 (2012).

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