Contributions in Geometry


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1°Axiomatic definition of equipollence.


2° About mappings that preserve alignment.


3° On maximal sub-groups of the group of positive isometries.

4° Fixed point of a group of rotations.


5° About similarities of Euclidean spaces. (Mappings that preserve circles or spheres).


6° Mappings that preserve a given angle.

7° Some characterizations of similarities.


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.)

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