Interacting thin shells in the interior of a Reissner–Nordstrøm black hole

In this paper we consider some applications of the extended Dray-t’Hooft–Redmount relation, considered earlier in Neronov (JHEP 11:007, 2001), Langlois and Maeda (Phys Rev Lett 88:181301, 2002), Berezin and Smirnov (Gravit Cosmol 9(4):235, 2003). In particular, using this relation, we study geometries of interacting thin shells near the future Cauchy horizon of a Reissner–Nordstrom black hole.