Ilwoo (Saint Ambrose University, Davenport, Iowa, USA) Cho 
Algebras, Graphs and their Applications [PDF ebook] 

This book introduces the study of algebra induced by combinatorial objects called directed graphs. These graphs are used as tools in the analysis of graph-theoretic problems and in the characterization and solution of analytic problems. The book presents recent research in operator algebra theory connected with discrete and combinatorial mathematic