Abstract
In this article, we investigate the existence, uniqueness, nonexistence, and regularity of weak solutions to the nonlinear fractional elliptic problem of type (P) (see below) involving singular nonlinearity and singular weights in smooth bounded domain. We prove the existence of weak solution in $$W_{loc}^{s,p}(\Omega )$$ via approximation method. Establishing a new comparison principle of independent interest, we prove the uniqueness of weak solution for $$0 \le \delta < 1+s- \frac{1}{p}$$ and furthermore the nonexistence of weak solution for $$\delta \ge sp.$$ Moreover, by virtue of barrier arguments we study the behavior of weak solutions in terms of distance function. Consequently, we prove Hölder regularity up to the boundary and optimal Sobolev regularity for weak solutions.
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