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u>0&\\quad\\mbox{in } \\Omega,\\\\ u=0&\\quad\\mbox{in } \\mathbb{R}^N\\setminus\\Omega, \\end{array}\\right. $$ where $\\Omega$ is an open bounded subset of $\\mathbb R^N$ with continuous boundary, dimension $N>2s$ with parameter $s\\in (0,1)$, $2^*_s=2N/(N-2s)$ is the fractional critical Sobolev exponent, $\\lambda>0$ is a real 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