(g₀, g₁, ..., g_k)-trees and unary OL systems

In this paper we extend the notion of (2, 3)-trees and AVL trees to (g0, g1,..., gk)-trees and (g1, g2,...,gk)-AVL trees, respectively, where 1≤g0<g1<g2<...<gk. Complete characterization of these two classes of trees in terms of their generators g0, g1,..., gk is given and the connection between (g0, g1,... gk)-trees and unary OL systems is mentioned. © 1983.