We show that algebraically shifting a pair of simplicial complexes weakly increases their relative homology Betti numbers in every dimension. More precisely, let Δ(K) denote the algebraically shifted complex of simplicial complex K, and let βj(K,L)=dimk H̃j(K,L;k) be the dimension of the jth reduced relative homology group over a field k of a pair of simplicial complexes L⊆K. Then βj(K,L)⩽βj(Δ(K),Δ(L)) for all j. The theorem is motivated by somewhat similar results about Gröbner bases and generic initial ideals. Parts of the proof use Gröbner basis techniques.
CITATION STYLE
Chrispeels, J. H., Andrews, C. A., & González, M. (2007). System Supports for Teacher Learning and School Improvement. In International Handbook of School Effectiveness and Improvement (pp. 787–806). Springer Netherlands. https://doi.org/10.1007/978-1-4020-5747-2_42
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