Topologie Hassan

Ce livre des Éléments de mathématique est consacré à la Topologie algébrique. Les quatre premiers chapitres présentent la théorie des revêtements d'un espace topologique et du groupe de Poincaré. On construit le revêtement universel d'un espace connexe pointé délaçable et on établit l'équivalence de catégories entre revêtements de cet espace et actions du groupe de Poincaré.

Arabian Affair is a one-off disco album by The Abdul Hassan Orchestra, lead by Dutch keyboardist Hans van Eijck, known for his work with After Tea and Tee-Set. While this orchestra was said to have featured Arab musicians and a belly dancer, they were anonymous musicians whose identities were unknown but they did have a disco hit, the title track. This was remastered and reissued in 1994 on Mercury/Phonogram.