Contributions in Geometry
Welcome and thank you for your visit.
2° About mappings that preserve alignment.
6° Mappings that preserve a given angle.
The original versions of articles 3° and 5° were published in the RMS ( Revue de Mathématiques Spéciales) :Number 9-10. May-June 1999 and number 7. March 1991 (Vuibert).
(2° and 6° are not translated yet from the french version.)