Geodesic
Solutions of Fixed Sign of Higher-Order Inhomogeneous Equations of Mixed Elliptic-Hyperbolic Type
Matematičeskie zametki, Tome 100 (2016) no. 3, pp. 433-440.

Voir la notice de l'article provenant de la source Math-Net.Ru

For a higher-order inhomogeneous equation of mixed elliptic-hyperbolic type, the property of the solution to be of fixed sign is established, depending on the sign of the right-hand side.
Keywords: inhomogeneous equation of mixed type, Lavrentev–Bitsadze operator, high-order equation, polyharmonic equation. 
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K. B. Sabitov. Solutions of Fixed Sign of Higher-Order Inhomogeneous Equations of Mixed Elliptic-Hyperbolic Type. Matematičeskie zametki, Tome 100 (2016) no. 3, pp. 433-440. http://geodesic.mathdoc.fr/item/MZM_2016_100_3_a9/

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