2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59870This paper contains some applications of Fourier-Mukai techniques to the birational geometry of threefolds. In particular, we prove that birational Calabi-Yau threefolds have equivalent derived categories. To do this we show how flops arise naturally as moduli spaces of perverse coherent sheaves.21 ppAlgebraic Geometrytext