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On a Frankl-type problem for a mixed parabolic-hyperbolic equation. (English. Russian original) Zbl 1367.35094

Sib. Math. J. 58, No. 2, 227-231 (2017); translation from Sib. Mat. Zh. 58, No. 2, 298-304 (2017).
Summary: We state a new nonlocal boundary value problem for a mixed parabolic-hyperbolic equation. The equation is of the first kind, i.e., the curve on which the equation changes type is not a characteristic. The nonlocal condition involves points in hyperbolic and parabolic parts of the domain. This problem is a generalization of the well-known Frankl-type problems. Unlike other close publications, the hyperbolic part of the domain agrees with a characteristic triangle. We prove unique solvability of this problem in the sense of classical and strong solutions.

MSC:

35M12 Boundary value problems for PDEs of mixed type
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