Let H be a cubic polynomial in two variables over R. Then H defines a quadratic Hamiltonian vector field (∂H/∂y, - ∂H/∂x). The purpose of this paper is to prove that there are exactly 28 non-equivalent topologic phase portraits of quadratic Hamiltonian vector fields. © 1994 by Academic Press, Inc.
|Journal||Journal of Differential Equations|
|Publication status||Published - 1 Jan 1994|