ar X iv : 0 80 5 . 20 65 v 1 [ m at h . A G ] 1 4 M ay 2 00 8 Virtual pull - backs
نویسنده
چکیده
We propose a generalization of Gysin maps for DM-type morphisms of stacks F → G that admit a perfect relative obstruction theory E F/G. We prove functoriality properties of the generalized Gysin maps. As applications, we analyze Gromov-Witten invariants of blow-ups and we give a short proof of Costello’s push-forward formula.
منابع مشابه
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تاریخ انتشار 2008