For Q>4 and α≤2Q/(Q−4), the equation σ_2(Hess_X u)=(−u)^α on the Heisenberg group admits no negative 2-convex entire solution.
Chang, Matthew J
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A Liouville theorem for the $2$-Hessian equation on the Heisenberg group
For Q>4 and α≤2Q/(Q−4), the equation σ_2(Hess_X u)=(−u)^α on the Heisenberg group admits no negative 2-convex entire solution.