Abstract
The first part of this paper is a theoretical study of the properties of the convex subsets of a tournament.
The main new results are about regular tournaments :
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Theorem 2 computes the maximum cardinality of a convex subset of a regular tournament.
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Theorem 3 gives the structure of a regular tournament of order 3k with a convex subset of cardinality k.
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Theorem 4 computes the maximum number of convex subsets of cardinality m that may be contained in a regular tournament of order n.
In the second part, we use these results to write an 0(n3) — algorithm which allows us to determine all the convex subsets of a regular tournament (this algorithm gives then, in polynomial-time, the answer to the following question : is a regular tournament simple or not ?).
The results of [2] about the decomposition of directed graphs, applied to regular tournaments allow to determine their convex subsets in time 0(n4).
Very recent results of [1] about digraph decompositions gives an 0(n3)-algorithm. Our result is less general but much simpler.
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Bibliographie
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© 1989 Springer-Verlag Berlin Heidelberg
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Astie-Vidal, A., Matteo, A. (1989). Non simple tournaments : Theoretical properties and a polynomial algorithm. In: Huguet, L., Poli, A. (eds) Applied Algebra, Algebraic Algorithms and Error-Correcting Codes. AAECC 1987. Lecture Notes in Computer Science, vol 356. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-51082-6_65
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DOI: https://doi.org/10.1007/3-540-51082-6_65
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