Critical $(p,q)$-fractional problems involving a sandwich type nonlinearity

Mousomi Bhakta, Alessio Fiscella, Shilpa Gupta

In this paper, we deal with the following $(p,q)$-fractional problem $$ (-Δ)^{s_{1}}_{p}u +(-Δ)^{s_{2}}_{q}u=λP(x)|u|^{k-2}u+θ|u|^{p_{s_{1}}^{*}-2}u \, \mbox{ in }\, Ω,\qquad u=0\,…