The spherical growth series of amalgamated free products of infinite cyclic groups

Michihiko Fujii, Takuya Sakasai

Let $n$ be an integer greater than $1$. We consider a group presented as $G(p_1,p_2,\dots ,p_n)=⟨x_1,x_2,\dots ,x_n\mid x_1^{p_1}=x_2^{p_2}=\cdots =x_n^{p_n}⟩$, with…