# The algebra of closed forms in a disk is Koszul

@inproceedings{Positselski2010TheAO,
title={The algebra of closed forms in a disk is Koszul},
author={Leonid Positselski},
year={2010}
}
We prove that the algebra of closed differential forms in an (algebraic, formal, or analytic) disk with logarithmic singularities along several coordinate hyperplanes is (both nontopologically and topologically) Koszul. The connection with variations of mixed Hodge–Tate structures is discussed in the introduction.

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