Symmetrization for Fractional Elliptic Problems: A Direct Approach

We provide new direct methods to establish symmetrization results in the form of a mass concentration (that is, integral) comparison for fractional elliptic equations of the type $$(-\Delta )^{s}u=f \, (0

Keywords:

• Rearrangement inequality
• Symmetrization
• Dirichlet boundary condition
• Bounded function
• Pointwise
• Pure mathematics
• Counterexample
• Direct methods
• Mathematics
• Direct method

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