The limit of Lagrangian surfaces in \(\mathbb{R}^ 4\)
The author gives an example to show that the limit of a sequence of Lagrangian surfaces in \(\mathbb{R}^ 4\) is not necessarily a Lagrangian surface. The author proves also that for the Lagrangian graphs over a Lagrangian plane (e.g. the \(x_ 1x_ 2\)-plane), the limit is a Lagrangian surface.
scientific article; zbMATH DE number 495433