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It is shown that group endomorphisms are exact flows if and only if they are exact in the measure-theoretic sense and that all flows which are exact with respect to an invariant measure with full support are exact. It is also proved that all locally eventually dense (led) flows have uniformly positive entropy (u.p.e.). 2000 Mathematics Subject Classification. Primary 37B05; Secondary 37B40, 37A35.doi:10.12775/tmna.2003.024 fatcat:a7efxc7lx5h7djannbhzxuap6i