Blar i Institutt for matematiske fag på tidsskrift "Abel Symposia"
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The Faá di Bruno Hopf algebra for multivariable feedback recursions in the center problem for higher order Abel equations
(Peer reviewed; Journal article, 2019)Poincaré’s center problem asks for conditions under which a planar polynomial system of ordinary differential equations has a center. It is well understood that the Abel equation naturally describes the problem in a ...