Abstract
We show that a meaningful dispersion relation and associated $\frac{N}{D}$ integral equations can be formulated for any partial-wave amplitude, even though the ordinary partial-wave dispersion relation with a finite number of subtractions is violated by models like that of Veneziano. It is also shown that the arbitrary cutoff of the $\frac{N}{D}$ method, which is often introduced to represent the high-energy behavior of the input "potential," can be eliminated in some models (including that of Veneziano) in terms of Regge parameters.
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