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(4) 2 (1975)), Gieseker conjectured that every stratified bundle (i.e. every O-coherent D-module) on X is trivial, if and only if the \\'etale fundamental group of X is trivial. This was proven by Esnault-Mehta in \"Simply connected projective manifolds in characteristic p> 0 have no nontrivial stratified bundles\" (Invent. 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