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Exponentially Dense Matroids

By Alexander Peter Nelson


This thesis deals with questions relating to the maximum density of rank-n matroids in a minor-closed class. Consider a minor-closed class M of matroids that does not contain a given rank-2 uniform matroid. The growth rate function is defined by hM(n) = max (|M | : M ∈M simple, r(M) ≤ n). The Growth Rate Theorem, due to Geelen, Kabell, Kung, and Whittle, shows that the growth rate function is either linear, quadratic, or exponential in n. In the case of expo-nentially dense classes, we conjecture that, for sufficiently large n, hM(n) = qn+k −

Year: 2011
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