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We present fundamental dynamic equations describing collective diffusive motions of deformed polymers. If we incorporate Doi's recent idea on the polymer diffusion in flow, the equations turn out to be different from those previously proposed by the present author (Phys. Rev. Lett. 62 (1989) 2472). In the absence of flow, on the other hand, they are consistent with a theory of Brochard and de Gennes. A seriously ambiguous assumption in the derivation remains.
Akira Ōnuki (Mon,) studied this question.