scholarly journals INVESTIGATION OF BOUNDARY VALUE PROBLEMS FOR DEGENERATE EQUATIONS OF PARABOLIC TYPE WITH GAS FILTRATION

2021 ◽  
Vol 91 (10-1) ◽  
Author(s):  
Abdujabbor Abdurazakov ◽  
Nasiba Makhmudova ◽  
Nilufar Mirzamakhmudova
Keyword(s):  
Boundary Value Problems ◽  
Boundary Value ◽  
Parabolic Type ◽  
Gas Filtration ◽  
Degenerate Equations

scholarly journals Boundary value problems of elliptic and parabolic type with boundary data of negative regularity

2021 ◽  
Author(s):  
Felix Hummel
Keyword(s):  
Boundary Value Problems ◽  
Half Space ◽  
Boundary Data ◽  
Boundary Value ◽  
Parabolic Type ◽  
Normal Direction ◽  
Parabolic Boundary ◽  
Parabolic Boundary Value Problems ◽  
Mixed Smoothness

AbstractWe study elliptic and parabolic boundary value problems in spaces of mixed scales with mixed smoothness on the half-space. The aim is to solve boundary value problems with boundary data of negative regularity and to describe the singularities of solutions at the boundary. To this end, we derive mapping properties of Poisson operators in mixed scales with mixed smoothness. We also derive $$\mathcal {R}$$ R -sectoriality results for homogeneous boundary data in the case that the smoothness in normal direction is not too large.

Non-well-ordered lower and upper solutions for semilinear systems of PDEs

2021 ◽  
pp. 2150080
Author(s):  
Alessandro Fonda ◽  
Giuliano Klun ◽  
Andrea Sfecci
Keyword(s):  
Boundary Value Problems ◽  
Differential Operators ◽  
Boundary Value ◽  
Parabolic Type ◽  
Existence Results ◽  
Second Order ◽  
Lower And Upper Solutions ◽  
Semilinear Systems ◽  
Systems Of Pdes ◽  
Abstract Framework

We prove existence results for systems of boundary value problems involving elliptic second-order differential operators. The assumptions involve lower and upper solutions, which may be either well-ordered, or not at all. The results are stated in an abstract framework, and can be translated also for systems of parabolic type.

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