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- W2241542739 abstract "We first discuss the problems in the theory of ordinary differential equations that gave rise to the concept of a flag system and illustrate these with the Cartan criterion for Monge equations (1st order) as well as the Cartan statement concerning the local equivalence of Monge-Amp`ere type equations (2nd order). Next, we describe a prolongation functor operating on the infinitesimal symmetries (automorphisms) of the Darboux flag and extending these, isomorphically, to all the symmetries of any other flag. Hence, flag systems cannot be distinguished by their symmetry algebras and the local classification of these objects is approached by considering higher order isotropies of these algebras as well as the groupoids of $k-th$ order formal equivalences since the differential equations defining the latter provide precious information for the application of flag systems to differential equations (textit{e.g.}, Cartan's criterion for non-linear Monge equations). In examining the behaviour of the isotropy algebras, that can either diminish or remain the same, when passing from a derived system $S_nu$ to the previous system $S_{nu-1}$, we obtain a full set of numerical invariants for the elementary flag systems that moreover specify the local models." @default.
- W2241542739 created "2016-06-24" @default.
- W2241542739 creator A5091743143 @default.
- W2241542739 date "2014-11-04" @default.
- W2241542739 modified "2023-10-06" @default.
- W2241542739 title "Automorphisms of Flag Systems" @default.
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- W2241542739 doi "https://doi.org/10.48550/arxiv.1411.0951" @default.
- W2241542739 hasPublicationYear "2014" @default.
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