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What does the Poincaré conjecture, one of the $1,000,000 prize-winning millennium problems, tell us? Let's put this conjecture back into its proper context, and take the opportunity to introduce the topology of manifolds. Erratum: the unit of the radius of the visible universe is obviously not the light year, but rather the billion light years. Card game photo album: https://photos.app.goo.gl/ryqPyFXiUYH... (Maybe one day I'll add more cards, action cards like topological glue, and it'll make an incredible card game) Animations made with: - Geogebra (2D and 3D animations) - Processing (torus and cylinders) - Curved Spaces (3D manifolds seen from the inside): http://www.geometrygames.org/CurvedSp... Script/comments/sources: http://eljjdx.canalblog.com/archives/... Music by TAM: • Tam - Beg you don't stop (ft. Navy) If you want to help me: My book: https://www.belin-editeur.com/le-choi... My tipeee: https://www.tipeee.com/el-jj My u-tip: https://www.utip.io/feed/eljjchouxrom...