A generalization of Hermite collineation to the n-dimensional space
A mathematical theory of origami constructions and numbers.
A Poncelet theorem in space.
A projective characterization of cyclicity.
A souped-up version of Pardini's theorem and its application to funny curves
Affine and projective generalization of Wallace lines.
An unexpected appearance of Steiner's hypocycloid.
Axes, plans cycliques, etc., dans les surfaces du second ordre