"Dualities" in graph theory and the related fields viewed from the metatheoretical standpoint
نویسنده
چکیده
The importance is emphasized of distinguishing clearly among different kinds of concepts usually referred to as "duality". Those different kinds of dualities concentrate in the "dual graph", wherefrom confusion is sometimes given rise to. The importance is illustrated by "new" theorems and concepts which are derived by understanding correctly the difference of the concepts.
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