A Generalization of Rosenfeld’s Lemma
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چکیده
0. Terminology and Notation. Throughout this talk, k is a differential field of characteristic zero under a set ∆ = {δ1, . . . , δm} of commuting derivations, and k{y1, . . . , yn} is the differential polynomial ring in n differential indeterminates over k. We denote by Θ the set of derivative operators generated by ∆: that is, Θ is the free commutative monoid generated by δ1, . . . , δm, so that an element of Θ has form δ1 1 δ k2 2 . . . δ km m . Put
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تاریخ انتشار 2005