Multiplicity of positive solutions to a critical fractional equation with Hardy potential and concave–convex nonlinearities

The Brezis–Nirenberg problem for fractional systems with Hardy potentials

“…where p, q > 1 are such that p + q ≤ 2 * s and a, b, c ∈ R satisfying suitable hypotheses. For more literatures concerning fractional elliptic problems with singular potentials, one can see previous works [20][21][22][23][24][25][26] and their references.…”