Updating <=, <-chains

  title={Updating <=, <-chains},
  author={James P. Delgrande and Arvind Gupta},
  journal={Inf. Process. Lett.},
We address the problem of very efficient reasoning and update in ≤, <-chains, where a ≤, <-chain is a directed acyclic graph such that there is a directed path between every pair of vertices, and edges are consistently labelled by ≤ or <. It is easy to show that, subsequent to an O(n) labelling scheme, queries concerning implied ≤ and < relations can be answered in O(1) time. However this scheme does not allow for efficient updates to a chain. We show via a novel encoding of precedence… CONTINUE READING


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