Int'l Conference on Real Analysis and Measure Theory »CARTEMI«, Ischia, Italy, 2004, "Application of Quasitopoi, Galois Connections, 16 years after ..."
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For practical purposes it is really one of the most efficient ways to construct limits (and colimits) via simple liftings of limits (colimits) of atoms for the corresponding universal structure. Applying these techniques is nothing else than just practising the real kernel of Topoi, Galois Theory, and other universal constructions.