Hartmut Ehrig

Abstract: "The algebraic approaches to graph transformation are based on the concept of gluing of graphs corresponding to pushouts in suitable categories of graphs and graph morphisms. This allows one to give not only an explicit algebraic or set theoretical description of the constructions but also to use concepts and results from category theory in order to build up a rich theory and to give elegant proofs even in complex situations. In the previous chapter we have presented an overview of the basic notions and problems common to the two algebraic approaches, the double-pushout (DPO) approach and the single-pushout (SPO) approach, and their solutions in the DPO-approach. In this chapter we introduce the SPO- approach to graph transformation and some of its main results. We study application conditions for graph productions and the transformation of more general structures than graphs in the SPO-approach, where similar generalizations have been or could be studied also in the DPO-approach. Finally, we present a detailed comparison of the DPO and the SPO-approach, especially concerning the solutions to the problems discussed for both approaches in the previous chapter."

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