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Warum ist der relative Hurewicz $$h: \pi_{n+1}(\mathrm{Cosk}{n-1}X, \mathrm{Cosk}{n}X) \to H_{n+1}(\mathrm{Cosk}{n-1}X, \mathrm{Cosk}{n}X; \mathbb{Z})$$ ein Iso? X ist einfachzshg, X -> Cosk_n{X} Postnikow-Schnitt