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Gram’s theorem for differential systems. (Russian) Zbl 0548.34050

Gram’s theorem for two-dimensional differential systems is proved. Furthermore by means of the Capelli identity it is shown, that for qualitative investigations of two-dimensional differential systems it is already sufficient to study the polynomial centro-affine comitants depending on only one vector.
Reviewer: K.Barckow

MSC:

34C99 Qualitative theory for ordinary differential equations
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