Partition Lattice q-Analogs Related to q-Stirling Numbers
نویسندگان
چکیده
Abstract We construct a family of partially ordered sets (posets) that are q-analogs of the set partition lattice. They are different from the q-analogs proposed by Dowling [5]. One of the important features of these posets is that their Whitney numbers of the first and second kind are just the q-Stirling numbers of the first and second kind, respectively. One member of this family [4] can be constructed using an interpretation of Milne [9] for S[n, k] as sequences of lines in a vector space over the Galois field Fq. Another member is constructed so as to mirror the partial order in the subspace lattice.
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