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math.CO2006
Signed differential posets and sign-imbalance
Thomas Lam
We study signed differential posets, a signed version of differential posets. These posets satisfy enumerative identities which are signed analogues of those satisfied by different…
math.CO2004★ 1 cited
Ribbon Schur Operators
Thomas Lam
A new combinatorial approach to the ribbon tableaux generating functions and q-Littlewood Richardson coefficients of Lascoux, Leclerc and Thibon is suggested. We define operators w…
math.CO2004
Two results on domino and ribbon tableaux
Thomas Lam
Inspired by the spin-inversion statistics of Schilling et al. and Haglund et al., we relate the symmetry of ribbon functions to a result of van Leeuwen, and also describe the multi…