Representations of sl(2) in the Boolean lattice, and the Hamming and Johnson schemes

Details Representations of sl(2) in the Boolean lattice, and the Hamming and Johnson schemes Representations of sl(2) in the Boolean lattice, and the Hamming and Johnson schemes

2011-02-02

arxiv.org/abs/1102.0368v2

Mathematics

Combinatorics

37 pages, 4 figures, 5 tables, added section 4.6 and 4 tables of states

Scientific paper

Starting with the zero-square "zeon algebra", the regular representation gives rise to a Boolean lattice representation of sl(2). We detail the su(2) content of the Boolean lattice, providing the irreducible representations carried by the algebra generated by the subsets of an n-set. The group elements are found, exhibiting the "special functions" in this context. The corresponding Leibniz rule and group law are shown. Krawtchouk polynomials, the Hamming and the Johnson schemes appear naturally. Applications to the Boolean poset and the structure of Hadamard-Sylvester matrices are shown as well.

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