Subject: announcement of preprint

From: categories <[email-masked]>
Date: Tue, 8 Jul 1997 14:19:24 -0300 (ADT)

Date: Tue, 8 Jul 1997 16:32:22 +0200
From: I. Moerdijk <[email-masked]>

Dear colleagues,

A ps-file of the following short preprint can be picked up from my homepage
(http://www.math.ruu.nl/people/moerdijk)

I Moerdijk, J. Vermeulen, Proof of a conjecture of A. Pitts.

Abstract: Using only elementary properties of inverse limits and localization,
we prove the Beck-Chevalley condition for lax pullbacks of coherent toposes. In
this way, we obtain a simple and constructive proof of the descent theorem for
coherent (pre)toposes.

With best regards, Ieke Moerdijk.