Abstract
In this paper we mainly study the global structure of the quaternion Bernoulli equations \({\dot q=aq+bq^n}\) for \({q\in {\mathbb{H}}}\), the quaternion field and also some other form of cubic quaternion differential equations. By using the Liouvillian theorem of integrability and the topological characterization of 2–dimensional torus: orientable compact connected surface of genus one, we prove that the quaternion Bernoulli equations may have invariant tori, which possesses a full Lebesgue measure subset of \({{\mathbb{H}}}\). Moreover, if n = 2 all the invariant tori are full of periodic orbits; if n = 3 there are infinitely many invariant tori fulfilling periodic orbits and also infinitely many invariant ones fulfilling dense orbits.
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Communicated by G. Gallavotti
The author is partially supported by NNSF of China grant 10831003 and Shanghai Pujiang Program grant 09PJD013.
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Zhang, X. Global Structure of Quaternion Polynomial Differential Equations. Commun. Math. Phys. 303, 301–316 (2011). https://doi.org/10.1007/s00220-011-1196-y
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DOI: https://doi.org/10.1007/s00220-011-1196-y