Structured -topos where
(1) is an -topos
(2) is a geometry, i.e. is an essentially small -category with finite limits, which is idempotent complete, is an admissible structure in .
(3) is a -structure (aka “structure sheaf”) on , i.e. a functor which is
(3a) left exact
(3b) induces a jointly epimorphic family in the image of (i.e. every covering sieve consisting of admissible morphisms on an object of induces an effective epimorphism out of the product of the images…)