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The Semigroup of Betti Diagrams

The recent proof of the Boij-Soederberg conjectures reveals new structure about Betti diagrams of modules, giving a complete description of the cone of Betti diagrams. We begin to expand on this new structure by investigating the semigroup of Betti diagrams. We prove that this semigroup is finitely generated, and we answer several other fundamental questions about this semigroup.

preprint2008arXivOpen access
Daniel Erman
math.ACmath.AG
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Daniel Erman

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