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	Hoffmann, Jorg     Options: All Media Types Journals Proceedings Div Books Whole Books Other Date Reviewed Title Author Publisher Published Date Descending Ascending Date Reviewed     1 - 1 of 1 reviews       Merge-and-shrink abstraction: a method for generating lower bounds in factored state spaces Helmert M., Haslum P., Hoffmann J., Nissim R. Journal of the ACM 61(3): 1-63, 2014.  Type: Article Pattern databases are heuristics used in search that rely on abstractions that aggregate states if they agree on a subset of the state variables. This paper considers a more general class of abstractions called merge-and-shrink abstrac...... Aug 6 2014
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