Discrete and Continuous Dynamical Systems
Department of Mathematics, Columbia University, Columbia University, New York, NY 10027
$ L_$φ$ u$:$=\sum $φij$u_{ij}=0$
must be linear in $2D$. The function φ is assumed to have the Monge-Ampere measure $\det D^2 $φ bounded away from $0$ and $\infty$.
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