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</script>We derive a formula for expressing free cumulants whose entries are products of random variables in terms of the lattice structure of non-crossing partitions. We show the usefulness of that result by giving direct and conceptually simple proofs for a lot of results about $R$-diagonal elements. Our investigations do not assume the trace property for the considered linear functionals.
26 pages, Latex2e
probability, Probability (math.PR), Mathematics - Operator Algebras, lattice of noncrossing partitions, Theoretical Computer Science, Computational Theory and Mathematics, Partitions of sets, FOS: Mathematics, Discrete Mathematics and Combinatorics, Mathematics - Combinatorics, Combinatorics (math.CO), Operator Algebras (math.OA), Mathematics - Probability
probability, Probability (math.PR), Mathematics - Operator Algebras, lattice of noncrossing partitions, Theoretical Computer Science, Computational Theory and Mathematics, Partitions of sets, FOS: Mathematics, Discrete Mathematics and Combinatorics, Mathematics - Combinatorics, Combinatorics (math.CO), Operator Algebras (math.OA), Mathematics - Probability
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