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C^1 Deformations of almost-Grassmannian structures with strongly essential symmetry. (arXiv:1902.01801v1 [math.DG])

We construct a family of $(2,n)$-almost Grassmannian structures of regularity $C^1$, each admitting a one-parameter group of strongly essential automorphisms, and each not flat on any neighborhood of the higher-order fixed point. This shows that Theorem 1.3 of [9] does not hold assuming only $C^1$ regularity of the structure (see also [2, Prop 3.5]).查看全文

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