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Spheres and balls as independence complexes
Department of Mathematics, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2M6.
Department of Mathematics & Statistics, Dalhousie University, 6297 Castine Way, PO BOX 15000, Halifax, Nova Scotia, Canada B3H 4R2.
Department of Mathematics & Statistics, Dalhousie University, 6297 Castine Way, PO BOX 15000, Halifax, Nova Scotia, Canada B3H 4R2.
Mälardalen University, Faculty of Philosophy, Department of Business and Mathematics.ORCID iD: 0000-0003-3244-4100
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2026 (English)In: Illinois Journal of Mathematics, ISSN 0019-2082, E-ISSN 1945-6581, Vol. 70, no 1, p. 77-97Article in journal (Refereed) Published
Abstract [en]

The terms whiskering, and more generally grafting, refer to adding generators to any monomial ideal to make the resulting ideal Cohen–Macaulay. We investigate the independence complexes of simplicial complexes that are constructed through a whiskering or grafting process, and we show that these independence complexes are (generalized) Bier balls. More specifically, the independence complexes are either homeomorphic to a ball or sphere. In a related direction, we classify when the independence complexes of very well-covered graphs are homeomorphic to balls or spheres.

Place, publisher, year, edition, pages
Duke University Press , 2026. Vol. 70, no 1, p. 77-97
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Algebra and Logic
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URN: urn:nbn:se:mdh:diva-77331DOI: 10.1215/00192082-12469402ISI: 001819982300005Scopus ID: 2-s2.0-105041402986OAI: oai:DiVA.org:mdh-77331DiVA, id: diva2:2067912
Available from: 2026-06-08 Created: 2026-06-08 Last updated: 2026-07-29Bibliographically approved

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Nicklasson, Lisa

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