Now showing items 1-2 of 2

    • 2-Semilattices: Residual Properties and Applications to the Constraint Satisfaction Problem 

      Payne, Ian (University of Waterloo, 2017-08-22)
      Semilattices are algebras known to have an important connection to partially ordered sets. In particular, if a partially ordered set $(A,\leq)$ has greatest lower bounds, a semilattice $(A;\wedge)$ can be associated to the ...
    • Series-Parallel Posets and Polymorphisms 

      Song, Renzhi (University of Waterloo, 2018-09-04)
      We examine various aspects of the poset retraction problem for series-parallel posets. In particular we show that the poset retraction problem for series-parallel posets that are already solvable in polynomial time are ...


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