In the next sections we describe in axiomatic-combinatorial terms what the chemists call structure and stereoformulas. To enhance the clarity of the exposition I provide more than the bare essentials. I begin by repeating some known definitions in graph theory. Some problems touched upon in the Introduction are going to be presented “officially” later on. I will adhere as much as possible to the terminology used by D. König in his elegant text.1 I will highlight where substantial departure seemed to better serve the special purpose of this paper.
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