Effective definability of Kolchin polynomials
Effective definability of Kolchin polynomials
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Kolchin 多项式的有效可定义性
DOI:
10.1090/proc/14869
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发表时间:
2020
影响因子:
1
通讯作者:
Li, Wei
中科院分区:
文献类型:
--
作者:
Freitag, James;León Sánchez, Omar;Li, Wei
While the natural model-theoretic ranks available in differentially closed fields (of characteristic zero), namely Lascar and Morley rank, are known not to be definable in families of differential varieties; in this note we show that the differential-algebraic rank given by the Kolchin polynomial is in fact definable. As a byproduct, we are able to prove that the property of being weakly irreducible for a differential variety is also definable in families. The question of full irreducibility remains open; it is known to be equivalent to the generalized Ritt problem. References
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