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- W1991642172 abstract "A map on clutters (collections of incomparable sets of a given set) is a function defined from the class of all clutters to itself, that sends a clutter on a ground set E to a clutter on the same set. Here we study two maps on clutters, the blocker map and the complementary map. Our main results include simple characterizations of these maps, which essentially say: the blocker map (the complementary map) is the only nontrivial map interchanging contraction and deletion operations. We also give new forbidden minor characterizations of matroids." @default.
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- W1991642172 date "1991-05-01" @default.
- W1991642172 modified "2023-09-26" @default.
- W1991642172 title "Clutters and matroids" @default.
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- W1991642172 doi "https://doi.org/10.1016/0012-365x(91)90364-8" @default.
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