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A $dd^Φ$-Lemma and Bott--Chern-type Cohomology for Spin(7)-Manifolds
We study the properties of the $dd^Φ$-operator on $8$-dimensional Spin(7)-manifolds with torsion-free Spin(7)-structures $Φ$. These operators were first introduced by Harvey and Lawson (An introduction to potential theory in calibrated geometry. Am.J. Math. 131.4 (2009), arXiv:0710.3920). We prove a
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