This lecture explains the cellular structure of the Klein bottle, obtained by attaching two cells to a wedge of two circles, and how it is homomorphic to a union of two Möbius strips.
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On étudie des notions de topologie générale: unions et quotients d'espaces topologiques; on approfondit les notions de revêtements et de groupe fondamental,et d'attachements de cellules et on démontre
