Geodesic
Compactness theorems for problems with unknown boundary
Dalʹnevostočnyj matematičeskij žurnal, Tome 21 (2021) no. 1, pp. 105-112 Cet article a éte moissonné depuis la source Math-Net.Ru

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The compactness theorem is proved for sequences of functions that have estimates of the higher derivatives in each subdomain of the domain of definition, divided into parts by a sequence of some curves of class $W_2^1$. At the same time, in the entire domain of determining summable higher derivatives, these sequences do not have. These results allow us to make limit transitions using approximate solutions in problems with an unknown boundary that describe the processes of phase transitions. 
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A. G. Podgaev; T. D. Kulesh. Compactness theorems for problems with unknown boundary. Dalʹnevostočnyj matematičeskij žurnal, Tome 21 (2021) no. 1, pp. 105-112. http://geodesic.mathdoc.fr/item/DVMG_2021_21_1_a8/

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