95-145 Bronstein I.U., Kopanskii A.Ya.
NORMAL FORMS OF VECTOR FIELDS SATISFYING CERTAIN GEOMETRIC CONDITIONS (41K, LaTeX) Mar 13, 95
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Abstract. The paper describes the simplified polynomial resonant normal forms of vector fields satisfying some geometric conditions (namely, preserving volume or symplectic forms or contact structures) with respect to $C^k$ smooth changes of variables preserving the same structure.

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