Abstract

Note.
We work in an arbitrary topos E, where a subobject Σ of the subobject
classifier Ω is given, which contains the truth value true. A subobject A ⊆ B
is called a Σ-subobject if its classifying map factors through Σ; clearly, the
factorization t : 1 → Σ of the generic subobject, classifies
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