A few more trees the chromatic symmetric function can distinguish

A well-known open problem in graph theory asks whether Stanley’s chromatic symmetric function, a generalization of the chromatic polynomial of a graph, distinguishes between any two nonisomorphic trees. Previous work has proven the conjecture for a class of trees called spiders. This paper generalizes the class of spiders to n -spiders, where normal spiders correspond to n = 1 , and verifies the conjecture for n = 2 .