Matroidal Entropy Functions: Constructions, Characterizations and Representations
In this paper, we characterize matroidal entropy functions, i.e., entropy functions in the form ๐ก = log v ยท๐ซ_M , where v โฅ 2 is an integer and ๐ซ_M is the rank function of a matroid M. By constructing the variable strength arrays of some matroid operations, we characterized matroidal entropy functions induced by regular matroids and some matroids with the same p-characteristic set as uniform matroid U_2,4.
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