Geodesic
Cyclic Transformations of Polygons and the Generalized Inverse
Canadian journal of mathematics, Tome 29 (1977) no. 4, pp. 756-770

Voir la notice de l'article provenant de la source Cambridge University Press

By a polygon with n vertices (an n-gon) we shall mean an ordered n-tuple of complex numbers (z 1, z 2, ... , zn ). The numbers zi will be called the vertices of the polygon. The zi may or may not be distinct, and it shall not matter whether a “conventional” polygon can be drawn with the zi as vertices. We shall operate in the spirit of the book of Bachmann and Schmidt [2] though not at the same level of algebraic generality inasmuch as these authors allow zi to belong to a general field. 
Davis, Philip J. Cyclic Transformations of Polygons and the Generalized Inverse. Canadian journal of mathematics, Tome 29 (1977) no. 4, pp. 756-770. doi: 10.4153/CJM-1977-079-8
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