2 citations · 2 across the 2 of their papers we have counts for
2 papers
math.CO2020
Counting Signed Vexillary Permutations
Yibo Gao, Kaarel Hänni
We show that the number of signed permutations avoiding 1234 equals the number of signed permutations avoiding 2143 (also called vexillary signed permutations), resolving a conject…
math.CO2020★ 2 cited
Boolean elements in the Bruhat order
Yibo Gao, Kaarel Hänni
We show that is boolean if and only if it avoids a set of Billey-Postnikov patterns, which we describe explicitly. Our proof is based on an analysis of inversion sets, and…