We prove that the power series expansion of the rational function of Gillis, Reznick and Zeilberger (1983) has only nonnegative coefficients.
On the existence of permutations conditioned by certain rational functions
On $e$-positivity and $e$-unimodality of chromatic quasisymmetric functions
An Answer to a Question of Zeilberger and Zeilberger about Fractional Counting of Partitions
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