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math.AG1999
Periods of mirrors and multiple zeta values
Michael E. Hoffman
In a recent paper, A. Libgober showed that the multiplicative sequence {Q_i(c_1,...,c_i)} of Chern classes corresponding to the power series Q(z)=1/Gamma(1+z) appears in a relation…
math.QA1999
Quasi-shuffle products
Michael E. Hoffman
Given a locally finite graded set A and a commutative, associative operation on A that adds degrees, we construct a commutative multiplication * on the set of noncommutative polyno…