In this paper, we consider a fractional equation with indefinite nonlinearities
$(-\vartriangle )^{α/2} u = a(x_1) f(u) $
for $0<α<2$ , where $a$ and $f$ are nondecreasing functions. We prove that there is no positive bounded solution. In particular, in the case $a(x_1) = x_1$ and $f(u) = u^p$ , this remarkably improves the result in [
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