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We investigate the commutators [b, I ρ ] of generalized fractional integral operators I ρ with functions b in generalized Campanato spaces and give a necessary and sufficient condition for the boundedness of the commutators on Orlicz spaces. To do this we define Orlicz spaces with generalized Young functions and prove the boundedness of generalized fractional maximal operators on the Orlicz spaces.2010 Mathematics Subject Classification. 46E30, 42B35.

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