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From: Barney Hilken <bhilken@cs.man.ac.uk>
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Subject: Pullback & coproduct of toposes
Date: Tue, 15 Jun 2004 16:38:17 +0100
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I don't have access to a decent library at the moment, and I can't
afford a copy of the Elephant myself, so can anyone let me know:

In the category of toposes and geometric morphisms, under what
conditions is coproduct stable under pullback?

Any reasonable conditions on the toposes or the morphisms would be
helpful, but the more general, the better.
Thanks,

Barney.