Exact expectation and variance of minimal basic of random matroids

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Exact expectation and variance of minimal basic of random matroids

We formulate and prove a formula to compute the expected value of the minimal random basis of an arbitrary finite matroid whose elements are assigned weights which are independent and uniformly distributed on the interval [0, 1]. This method yields an exact formula in terms of the Tutte polynomial. We give a simple formula to find the minimal random basis of the projective geometry PG (r − 1, q).

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The expansion axiom of matroids requires only the existence of some kind of independent sets, not the uniqueness of them. This causes that the base families of some matroids can be reduced while the unions of the base families of these matroids remain unchanged. In this paper, we define unique expansion matroids in which the expansion axiom has some extent uniqueness; we define union minimal ma...

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ژورنال

عنوان ژورنال: Discussiones Mathematicae Graph Theory

سال: 2013

ISSN: 1234-3099,2083-5892

DOI: 10.7151/dmgt.1662