?? universal property ... of structure type category wrt proposed morphisms ... ???
?? duality ... z-elt vs z-torsor ... ??? module vs co-module ... ??? .....
?? terry bisson .... ???? vague memories ... categorified fourier duality ... ???? cartesian vs otherwise .... ??? ....
?? equivalent .... in topos picture of proposed morphism in "ag+t" picture ... ??
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