On spectral geometry for the one-speed particle transport operator
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 55 (2015) no. 5, pp. 846-849

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It is proved that, among all domains of identical measure, the ball minimizes the first eigenvalue of the one-speed particle transport operator in a multidimensional Euclidean space.
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D. Suragan. On spectral geometry for the one-speed particle transport operator. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 55 (2015) no. 5, pp. 846-849. http://geodesic.mathdoc.fr/item/ZVMMF_2015_55_5_a10/