J'ai réalisé quelques objets 3D manipulables permettant de se représenter le cross-cap, à partir du "pliage" d'une topologie plane, et également de l'obstruction liée à sa représentation par un "recouvrement" sphérique. À toute fin utile...Le vendredi 25 septembre 2026 à 10:50:19 UTC+2, Jacques B. Siboni via Topologos <topologos@lutecium.org> a écrit :Dear friends and colleagues
Our last workshop on September 12 is now available on YouTube,
there is some delay to find it on Lutecium, it will be available
probably soon. But you can have an access to it there:the chapters we have been through are:
5. Geometry of the Projective Plane 6. Standing on the Object a 7. Navigate over the Projective Plane; R schema, I Schema 8. Small encounter with the Cross Cap 9. Crossing over the Phantasm (revisited)
A third one will take place in October or maybe in November
Your comments are welcome
All the best
Jacques
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