Long, D. and Fox, M. (2003) Plan permutation symmetries as a source of inefficiency in planning. In: 22nd UK Planning and Scheduling Special Interest Group, 2003-12-09 - 2003-12-10, Glasgow.
This paper briefly reviews sources of symmetry in planning and highlights one source that has not previously been tackled: plan permutation symmetry. Symmetries can be a significant problem for efficiency of planning systems, as has been previously observed in the treatment of other forms of symmetry in planning problems. We examine how plan permutation symmetries can be eliminated and present evidence to support the claim that these symmetries are an important problem for planning systems.
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