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math.DS2004
Planar quadratic vector fields with invariant lines of total multiplicity at least five
Dana Schlomiuk, Nicolae Vulpe
In this article we consider the action of affine group and time rescaling on planar quadratic differential systems. We construct a system of representatives of the orbits of system…
math.DS2003
Equivariant versal unfoldings for linear retarded functional differential equations
Pietro-Luciano Buono, Victor G. LeBlanc
We continue our investigation of versality for parametrized families of linear retarded functional differential equations (RFDEs) projected onto finite-dimensional invariant manifo…