Three Partition Refinement Algorithms

@article{Paige1987ThreePR,
  title={Three Partition Refinement Algorithms},
  author={Robert Paige and Robert Endre Tarjan},
  journal={SIAM J. Comput.},
  year={1987},
  volume={16},
  pages={973-989}
}
We present improved partition refinement algorithms for three problems: lexicographic sorting, relational coarsest partition, and double lexical ordering. Our double lexical ordering algorithm uses a new, efficient method for unmerging two sorted sets. 
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