Geodesic
New possibilities of verifying analyticity
Teoretičeskaâ i matematičeskaâ fizika, Tome 26 (1976) no. 1, pp. 137-140

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It is shown that if dispersion relations hold for the scattering amplitude then, without any additional assumptions, dispersion relations can also be proved for its logarithm. A new way of verifying analyticity is proposed. 
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     title = {New possibilities of verifying analyticity},
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Yu. S. Vernov; O. V. Dumbrais; T. Yu. Dumbrais; M. N. Mnatsakanova. New possibilities of verifying analyticity. Teoretičeskaâ i matematičeskaâ fizika, Tome 26 (1976) no. 1, pp. 137-140. http://geodesic.mathdoc.fr/item/TMF_1976_26_1_a11/