Geodesic
$GL(2,R)$-orbits of the polynomial sistems of differential equations
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 3 (2004), pp. 25-40

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In this work we study the orbits of the polynomial systems $\dot x=P(x_1,x_2)$, $\dot x=Q(x_1,x_2)$ by the action of the group of linear transformations $GL(2,R)$. It is shown that there are not polynomial systems with the dimension of $GL$-orbits equal to one and there exist $GL$-orbits of the dimension zero only for linear systems. On the basis of the dimension of $GL$-orbits the classification of polynomial systems with a singular point $O(0,0)$ with real and distinct eigenvalues is obtained. It is proved that on $GL$-orbits of the dimension less than four these systems are Darboux integrable. 
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     author = {Angela P\u{a}\c{s}canu and Alexandru \c{S}ub\u{a}},
     title = {$GL(2,R)$-orbits of the polynomial sistems of differential equations},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {25--40},
     publisher = {mathdoc},
     number = {3},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2004_3_a3/}
}
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Angela Păşcanu; Alexandru Şubă. $GL(2,R)$-orbits of the polynomial sistems of differential equations. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 3 (2004), pp. 25-40. http://geodesic.mathdoc.fr/item/BASM_2004_3_a3/