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Journals ACM SIGART Bulletin Issue 78

A+ algorithms are A algorithms (as studied by Nilsson) satisfying two additional constraints which magnify the breadth aspect of a graph search. Use of A+ algorithms is perhaps most plausible when it is desirable to generate alternative goal nodes on optimal paths. There are two principal results for A+ algorithms. First, if A 1 and A 2 are A+ algorithms and A 2 is as well informed as A 1 then A 2 expands no more nodes than A1 does. Second, if an A+ algorithm is modified so as to return a set of optimal paths and the monotone condition is satisfied, the A+ algorithm returns a set of solutions consisting of an optimal path to each goal node on an optimal path.

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Reasonable breadth-biased: A algorithms

Gumb, Raymond D.
ACM SIGART Bulletin , Volume (78)
Association for Computing Machinery – Oct 1, 1981

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