  We prove the Bogomolov-Gieseker type inequality conjectured by Bayer, Macri
and Toda for some products of three curves. This gives the first examples of
Bridgeland stability conditions on some threefolds of general type. The key
ingredients are the spreading out technique, Frobenius morphism and Bogomolov's
inequality for product type varieties in positive characteristic, proved by the
author recently.
