A Short Proof of a Gauss Problem
De Fraysseix, Hubert and Ossona de Mendez, Patrice (1998) A Short Proof of a Gauss Problem. In: Graph Drawing 5th International Symposium, GD '97, September 18-20, 1997, Rome, Italy , pp. 230-235 (Official URL: http://dx.doi.org/10.1007/3-540-63938-1_65).
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A traversal of a self crossing closed plane curve, with points of multiplicity at most two, defines a double occurrence sequence. C.F. Gauss conjectured  that such sequences could be characterized by their interlacement properties. This conjecture was proved by P. Rosenstiehl in 1976 . We shall give here a simple self-contained proof of his characterization. This new proof relies on the D-switch operation.
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