This lecture explores the preimages of closed sets in the disjoint union, focusing on the separability of re-bonding and the pushout diagram. It delves into the identification scenarios and the inclusion of metric spaces.
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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