Descent of ordinary differential equations with rational general solutions

Descent of ordinary differential equations with rational general solutions
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具有有理通解的常微分方程的下降

DOI:
10.1007/s11424-020-9310-x
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发表时间:
2020-09
影响因子:
2.1
通讯作者:
Ruyong Feng
Ruyong Feng
中科院分区:
数学3区
文献类型:
--
作者:
Shuang Feng;Ruyong Feng

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设F是k(T)上的不可约微分多项式,k是特征为零的代数闭域。证明了F=0存在有理通解的充要条件是k(T)上与F相关的微分代数函数域是由常数生成的,即F定义的簇下降到k上的一个簇,从而证明了如果F是一阶的且有移动奇点,则F只有有限多个有理解.
Let F be an irreducible differential polynomial over k(t) with k being an algebraically closed field of characteristic zero. The authors prove that F = 0 has rational general solutions if and only if the differential algebraic function field over k(t) associated to F is generated over k(t) by constants, i.e., the variety defined by F descends to a variety over k. As a consequence, the authors prove that if F is of first order and has movable singularities then F has only finitely many rational solutions.
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