Abstract
Abstract We consider the problem of attainability of the best constant C > 0 in the following critical fractional Hardy-Sobolev inequality: For all , , where and γ ∈ ℝ. This allows us to establish the existence of nontrivial weak solutions for the following doubly critical problem on ℝn, , where is the critical α-fractional Sobolev exponent, and , the latter being the best fractional Hardy constant on ℝn.
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