EN
We establish the existence of at least three weak solutions for the (p1,…,pₙ)-biharmonic system
⎧$Δ(|Δu_{i}|^{p−2}Δu_{i}) = λF_{u_{i}}(x,u₁,…,uₙ)$ in Ω,
⎨
⎩$u_{i} = Δu_{i} = 0$ on ∂Ω,
for 1 ≤ i ≤ n. The proof is based on a recent three critical points theorem.