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Numerous astrophysical observations have shown that classical Newtoniandynamics fails on galactic scales and beyond, if only visible matter is takeninto account. The two most popular theoretical concepts dealing with thisproblem are Dark Matter (DM) and Modified Newtonian Dynamics (MOND). In thefirst part of this paper it is demonstrated that a generalized MOND equationcan be derived in the framework of Newtonian Dark Matter theory. For systemssatisfying a fixed relationship between the gravitational fields caused by DMand visible matter, this generalized MOND equation reduces to the traditionalMOND law, first postulated by Milgrom. Therefore, we come to the conclusionthat traditional MOND can also be interpreted as special limit case of DMtheory. In the second part, a formal derivation of the Tully-Fisher relation isdiscussed.Comment: 5 pages, accepted for publication in Astrophys. J. Letter

On the Relationship between Modified Newtonian Dynamics and Dark Matter