Geodesic
The solution of one problem of extremal decomposition
Dalʹnevostočnyj matematičeskij žurnal, Tome 2 (2001) no. 1, pp. 3-15 
E. V. Kostyuchenko. The solution of one problem of extremal decomposition. Dalʹnevostočnyj matematičeskij žurnal, Tome 2 (2001) no. 1, pp. 3-15. http://geodesic.mathdoc.fr/item/DVMG_2001_2_1_a0/
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We prove that the maximum value of multiplication of inner radiuses for three nonoverlapping domains in the disk attains for three equal sectors.

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