En résumé (grâce à un LLM libre auto-hébergé)

The document deals with the sphere eversion and various stories related to geometry and topology.

It addresses concepts such as immersions, double coverings and the Boy surface.

Links are provided to studies on the Cross Cap transformations and the torus eversion.

Sphere inversion and topology

The Sphere Inversion

and other stories of the same kind

December 7, 2004

********Link

********Link.

********Link

************Link

********Link

************Link
Immersions. Double coverings. First approach to the Boy surface

Interlude: The "father - mutation" of the cusp points of a Crosscap

Catastrophic modifications

The sphere inversion according to Bernard Morin

The trivial inversion of the torus

The non-trivial inversion of the torus

J.P.Petit, 1961

********Link| Other topic: Transformation of a Cross Cap into a Boy surface | ( | J.P.Petit 1990 | ) : |
|---|---|---|---|

( take some aspirin, otherwise return to the Home page )

Turnover of the sphere and topology