Two examples of nonhomogeneous orbit closures

Two examples of nonhomogeneous orbit closures

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Francois Maucourant, Université de Rennes 1
Fine Hall 224

We will explain how to construct orbits of non-homogeneous closure for some subgroup of the diagonal group acting on the space of lattices of dimension at least 6. Also, a similar example for the action of *2,*3 on the four dimensionnal torus is discussed.