HOW TO DRAW A GRAPH
HOW TO DRAW A GRAPH By W. T. TUTTE [Received 22 May 1962] 1. Introduction WE use the definitions of (11). However, in deference to some recent attempts to unify the terminology of graph theory we replace the term ‘circuit’ by ‘polygon’, and ‘degree’ by ‘valency’. A graph G is 3-connected (nodally 3-connected) if it is simple and non-separable and satisfies the following condition; if G is the union of two proper subgraphs H and K such that HnK consists
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