On the uniqueness of limit cycles for Liénard equations: the legacy of G. Sansone
Abstract
We give an account of the results about limit cycle’s uniqueness for Liénard equations, starting from Levinson-Smith’s one to the most recent ones. We present a new uniqueness theorem in the line of Sansone-Massera’s geometrical approach.The authors retain all rights to the original work without any restrictions.
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