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Postnikov-decompositions of functors
Dedicated to Alexander Dinghas on the occasion of his 60th birthday The purpose of a Postnikov-decomposition of a covariant functor Φ: ^ -> (£ is to approximate Φ by simpler functors Ψ' $ -» & (so called Postnikov-functors for Φ) which reflect certain properties of Φ but are simpler to …