Contact Info
Pure MathematicsUniversity of Waterloo
200 University Avenue West
Waterloo, Ontario, Canada
N2L 3G1
Departmental office: MC 5304
Phone: 519 888 4567 x33484
Fax: 519 725 0160
Email: puremath@uwaterloo.ca
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Since irreflexive digraphs often pp-define partially reflexive digraphs, we can show they yield NP-complete CSP templates by understanding certain mixed-type cases. A tournament of mixed-type is a digraph in which distinct vertices have exactly one oriented edge between them, and loops are not prohibited. We classify tournaments of mixed-type closed under a Taylor operation, and show their polymorphism algebras generate congruence meet-semidistributive varieties. In this first talk, we start the proof of this result.
Departmental office: MC 5304
Phone: 519 888 4567 x33484
Fax: 519 725 0160
Email: puremath@uwaterloo.ca
The University of Waterloo acknowledges that much of our work takes place on the traditional territory of the Neutral, Anishinaabeg and Haudenosaunee peoples. Our main campus is situated on the Haldimand Tract, the land promised to the Six Nations that includes six miles on each side of the Grand River. Our active work toward reconciliation takes place across our campuses through research, learning, teaching, and community building, and is centralized within our Indigenous Initiatives Office.