Abstract

The main result of this Note is the following: for an algebraic system which evolution depends on variables which are partitionned into w and z, the elimination of the z leads to one set of differential algebraic equations (hence, with no inequations) if the projection map along z is a finite morphism of algebraic varieties; that is, if the differential algebra which defines the system is integral over a suitable differential subalgebra. To obtain this result, is lifted to differential algebra a more general, and well-known result in algebraic geometry which states that a finite morphism of algebraic varieties is a closed one with respect to the Zariski topology.Key Wordsfinite morphisms of differential algebraic varietieselimination theoryalgebraic systems theory

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