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Poset structures in Boij Söderberg theory
Stockholm University, Faculty of Science, Department of Mathematics.
2012 (English)In: International mathematics research notices, ISSN 1073-7928, E-ISSN 1687-0247, no 22, 5132-5160 p.Article in journal (Refereed) Published
Abstract [en]

Boij-Soderberg theory is the study of two cones: the cone of Betti diagrams of standard graded minimal free resolutions over a polynomial ring and the cone of cohomology tables of coherent sheaves over projective space. We provide a new interpretation of these partial orders in terms of the existence of nonzero homomorphisms, for both the general and equivariant constructions. These results provide new insights into the families of modules and sheaves at the heart of Boij-Soderberg theory: Cohen-Macaulay modules with pure resolutions and supernatural sheaves. In addition, they suggest the naturality of these partial orders and provide tools for extending Boij-Soderberg theory to other graded rings and projective varieties.

Place, publisher, year, edition, pages
2012. no 22, 5132-5160 p.
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URN: urn:nbn:se:su:diva-83979DOI: 10.1093/imrn/rnr222ISI: 000310968200004OAI: diva2:578054


Available from: 2012-12-17 Created: 2012-12-17 Last updated: 2012-12-17Bibliographically approved

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