Orbitally symmetric systems with applications to planar centers
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Abstract
We present a generalization of the most usual symmetries in differential equations known as the time-reversibility and the equivariance ones. We check that the typical properties are also valid for the new definition that unifies both. With it, we are able to present new families of planar polynomial vector fields having equilibrium points of center type. Moreover, we provide the highest lower bound for the local cyclicity of an equilibrium point of polynomial vector fields of degree 6; M(6) ≥ 48.
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Communications on Pure and Applied Analysis, v. 20, n. 10, p. 3301-3329, 2021.
