Maria Leonor Moreira

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Cordovil, R., K. Fukuda and M.L. Moreira, Clutters and matroids, Discrete Mathematics 89 (1991) 161-171. 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(More)
Characterisations of symplectic and orthogonal Lagrangian matroids in terms of basis exchange are well known. We de4ne circuits of Lagrangian matroids in a natural way and characterise Lagrangian matroids in terms of circuit axioms. We go on to characterise orthogonal Lagrangian matroids in terms of circuits, and prove a result that may be useful in(More)
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