Homological properties of monomial ideals associated to quasi-trees and lattices

Monomials are the link between Commutative Algebra and Combinatorics. In this thesis we concentrate on monomial ideals. With a simplicial complex delta one can associate two squarefree monomial ideals: the Stanley-Reisner ideal I delta whose generators correspond to the non-faces of delta, or the facet ideal I(delta) whose generators correspond to the facets of delta. To a semi-lattice we associate a squarefree monomial, which is called Hibi ideal. The homological properties of Stanley-Reisner ideal, facet ideal and Hibi ideal are studied in this thesis.



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