%0 Journal Article %T Postnikov-Stability versus Semistability of Sheaves %A Georg Hein %A David Ploog %J Mathematics %D 2009 %I arXiv %X We present a novel notion of stable objects in a triangulated category. This Postnikov-stability is preserved by equivalences. We show that for the derived category of a projective variety this notion includes the case of semistable sheaves. As one application we compactify a moduli space of stable bundles using genuine complexes via Fourier-Mukai transforms. %U http://arxiv.org/abs/0901.1554v1