On flowchart theories: part II. The nondeterministic case
Theoretical Computer Science
Towards a new algebraic foundation of flowchart scheme theory
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A Kleene theorem for a class of planar acyclic graphs
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Network Algebra
Span(Graph): A Categorial Algebra of Transition Systems
AMAST '97 Proceedings of the 6th International Conference on Algebraic Methodology and Software Technology
An Initial-Algebra Approach to Directed Acyclic Graphs
MPC '95 Mathematics of Program Construction
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It was known that every graph can be constructed from a finite list of elementary graphs using the operations of graph sum and graph composition. We determine a complete set of "equations" or rewriting rules with the property that two expressions represent the same graph if and only if one can be transformed into the other by means of these rules.