Closed form algebra on a disk is Koszul
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- Positselski, L.E. Funct Anal Its Appl (2012) 46: 218. doi:10.1007/s10688-012-0027-z
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We prove that the algebra of closed differential forms on an (algebraic, formal, or analytic) disk with logarithmic singularities along several coordinate hyperplanes is Koszul (both nontopologically and topologically). A relation to variations of mixed Hodge-Tate structures is discussed in the introduction.