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Relational methods can be found at various places in§computer science, notably in data base theory, relational§semantics of concurrency, relationaltype theory, analysis§of rewriting systems, and modern programming language§design. In addition, they appear in algorithms analysis and§in the bulk of discrete mathematics taught to computer§scientists.§This book is devoted to the background of these methods. It§explains how to use relational and graph-theoretic methods§systematically in computer science.§A powerful formal framework of relational algebra is§developed with respect to applications to a diverse range of§problem areas. Results are first motivated by practical§examples, often visualized by both Boolean 0-1-matrices and§graphs, and then derived algebraically.