The Verified Incremental Design of a Distributed Spanning Tree Algorithm: Extended Abstract

Author:

Hesselink Wim H.1

Affiliation:

1. Department of Mathematics and Computing Science, Rijksuniversiteit Groningen, Groningen, The Netherlands, NL

Abstract

Abstract. The paper announces an incremental mechanically–verified design of the algorithm of Gallager, Humblet, and Spira for the distributed determination of the minimum-weight spanning tree in a graph of processes. The processes communicate by means of asynchronous messages with their neighbours in the graph. Messages over one link may pass each other. The proof of the algorithm is based on ghost variables, invariants, and a decreasing variant function. The verification is mechanized by means of the theorem prover Nqthm of Boyer and Moore. This extended abstract is an introduction to the full paper that can be obtained by ftp (http://link.springer.de/link/service/journals/00165/).

Publisher

Association for Computing Machinery (ACM)

Subject

Theoretical Computer Science,Software

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