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This paper is concerned with the following fractional Schrödinger–Poisson system:whereis a parameter,,,,is allowed to be sign-changing and  f  is an indefinite function. We require thatwithhaving a potential well Ω whose depth is controlled by  λ  andfor all. Under some suitable assumptions onand, we prove that the above system has at least two nontrivial solutions. Moreover, the phenomenon of concentration of the solutions is also explored.

Multiplicity and concentration of solutions for a fractional Schrödinger–Poisson system with sign-changing potential