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We classify polynomial models for real hypersurfaces in $\mathbb C^N$, whichadmit nonlinearizable infinitesimal CR automorphisms. As a consequence, thisprovides an optimal 1-jet determination result in the general case. Further weprove that such automorphisms arise from one common source, by pulling back viaa holomorphic mapping a suitable symmetry of a hyperquadric in some complexspace.

Nonlinearizable CR automorphisms for polynomial models in $\mathbb C^N$