, Volume 46, Issue 3, pp 218-224
Date: 14 Sep 2012

Closed form algebra on a disk is Koszul

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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.

Translated from Funktsional’nyi Analiz i Ego Prilozheniya, Vol. 46, No. 3, pp. 71–80, 2012
|Original Russian Text Copyright © by L. E. Positselski
This work was supported by E. Balzan’s prize in mathematics won by P. Deligne in 2004, the Simons foundation, and RFBR grants nos. 10-01-93113-NTsNIL a, 11-01-00393-a, and 11-01-12072-ofi-m-2011.