Geodesic
Topological properties of Landau curves in connection with Mandelstam's conjecture
Teoretičeskaâ i matematičeskaâ fizika, Tome 23 (1975) no. 3, pp. 335-347 Cet article a éte moissonné depuis la source Math-Net.Ru

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Feynman amplitude $F_G$ assotiated with the Feynman graph $G$ is considered for the case of the scalar scattering reaction of the $1+2\to 3+4$ type. Sufficient conditions of validity of the Mandelstam hypothesis [1] are found as conditions on the Landau curves $\mathscr L_G$ for the amplitude $F_G$, $G\in \Re$ where $\Re$ is a certain class of the Feynmann graphs introduced in the work. Application of the criteria obtained to the ladder graph is considered. 
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     title = {Topological properties of {Landau} curves in connection with {Mandelstam's} conjecture},
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V. Z. Ènol'skii. Topological properties of Landau curves in connection with Mandelstam's conjecture. Teoretičeskaâ i matematičeskaâ fizika, Tome 23 (1975) no. 3, pp. 335-347. http://geodesic.mathdoc.fr/item/TMF_1975_23_3_a5/

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