Report - B-FIELDS, GERBES AND GENERALIZED GEOMETRYmaths.dur.ac.uk/.../LMS/2005/GCFTST/Talks/hitchin1.pdfcomplex structures J1,J2 such that (J1J2(X+ξ),X+ξ) is deﬁ-nite. GUALTIERI’S THEOREM

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