Kozerenko, S.
(ДЗ "ЛНУ імені Тараса Шевченка", 2017)
Given a pair (X, σ) consisting of a finite tree X and its vertex self-map σ one can construct the corresponding Markov graph Γ(X, σ) which is a digraph that encodes σ-covering relation between edges in X. M-graphs are ...