DATE2020-11-26 16:10-17:00


SPEAKER葉永南 研究員(中央研究院數學研究所

TITLEChen’s Grammars and Several Applications in Combinatorics (II)

ABSTRACT In this talk, we first apply the change of grammars method to study gamma-positivity and partial gamma-positivity of descent-type polynomials. We then show the symmetry of the coefficients polynomials of the Jacobi elliptic function sn(u,k). At last, we show the semi-gamma-positivity of the alternating runs polynomials of dual Stirling permutations.