Generalized Calabi-Yau manifolds(25)

ρ→expB∧ρ.

WhenBisclosed,thistakesclosedformstoclosedforms,butto xthecohomologyclassweneedBingeneraltobeexact,forthenB=dξand

(expdξ)∧ρ=ρ+d(ξ∧ρ+1

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