We calculate the group of homotopy classes of homotopyself-equivalences of $4$-manifolds with free fundamental group andobtain a classification of such $4$-manifolds up to $s$-cobordism.
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机译：我们计算了$ 4 $-流形与自由基本组的同伦自等价的同伦类组，并获得了这种$ 4 $-流形的分类，最高到$ s $ -cobordism。
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