Semiantichains and Unichain Coverings in Direct Products of Partial Orders.
Abstract
We conjecture a generalization of Dilworth's theorem to direct products of partial orders. In particular, we conjecture that the largest 'semiantichain' and the smallest 'unichain covering' have the same size. We consider a special class of semiantichains and unichain coverings and determine when equality holds for them. This conjecture implies the existence of k-saturated partitions. A stronger conjecture, for which we also prove a special case, implies the Greene-Kleitman result on simultaneous k and (k+1)-saturated partitions. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1980
- Accession Number
- ADA092256
Entities
People
- Craig A. Tovey
- Douglas B. West
Organizations
- Stanford University