8 citations · 9 across the 3 of their papers we have counts for
3 papers
math.CO2013★ 8 cited
Compositions and Fibonacci Identities
Ira M. Gessel, Ji Li
We study formulas expressing Fibonacci numbers as sums over compositions using free submonoids of the free monoid of compositions with parts 1 and 2.
math.CO2007★ 1 cited
Enumeration of Point-Determining Graphs
Ira Gessel, Ji Li
Point-determining graphs are graphs in which no two vertices have the same neighborhoods, co-point-determining graphs are those whose complements are point-determining, and bi-poin…
math.CO2007
Prime Graphs and Exponential Composition of Species
Ji Li
In this paper, we enumerate prime graphs with respect to the Cartesian multiplication of graphs. We use the unique factorization of a connected graph into the product of prime grap…