Generalization of Markov Diophantine equation via generalized cluster algebra

Abstract

In this paper, we deal with two classes of Diophantine equations, $x^2+y^2+z^2+k_{1}yz+k_{2}zx+k_{3}xy=(3+k_1+k_2+k_3)xyz$ and $x^2+y^4+z^4+k{y}^2{z}^2+2x{z}^2+2x{y}^2=(7+k)x{y}^2{z}^2$, where $k_1,k_2,k_3,k$ are nonnegative integers. The former is known as the Markov Diophantine equation if $k_1=k_2=k_3=0$, and the latter is a Diophantine equation recently studied by Lampe if $k=0$. We give algorithms to enumerate all positive integer solutions to these equations, and discuss the structures of the generalized cluster algebras behind them.

15 pages, addition of Remark 4.3, minor corrections. arXiv admin note: text overlap with arXiv:2109.09639