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Cm solutions of semialgebraic or definable equations
Advances in Mathematics ( IF 1.5 ) Pub Date : 2021-05-07 , DOI: 10.1016/j.aim.2021.107777
Edward Bierstone , Jean-Baptiste Campesato , Pierre D. Milman

We address the question of whether geometric conditions on the given data can be preserved by a solution in (1) the Whitney extension problem, and (2) the Brenner-Fefferman-Hochster-Kollár problem, both for Cm functions. Our results involve a certain loss of differentiability.

Problem (2) concerns the solution of a system of linear equations A(x)G(x)=F(x), where A is a matrix of functions on Rn, and F,G are vector-valued functions. Suppose the entries of A(x) are semialgebraic (or, more generally, definable in a suitable o-minimal structure). Then we find r=r(m) such that, if F(x) is definable and the system admits a Cr solution G(x), then there is a Cm definable solution. Likewise in problem (1), given a closed definable subset X of Rn, we find r=r(m) such that if g:XR is definable and extends to a Cr function on Rn, then there is a Cm definable extension.



中文翻译:

C 半代数或可定义方程的解

我们解决以下问题:是否可以通过(1)惠特尼扩展问题和(2)Brenner-Fefferman-Hochster-Kollár问题中的解来保留给定数据上的几何条件 C职能。我们的结果包括一定程度的可微性损失。

问题(2)涉及线性方程组的解 一种XGX=FX,其中A是以下函数的矩阵[Rñ, 和 FG是向量值函数。假设一种X是半代数的(或更普遍地,可以以合适的o-最小结构定义)。然后我们发现[R=[R 这样,如果 FX 是可定义的,系统允许 C[R 解决方案 GX,然后有一个 C可定义的解决方案。同样地,在问题(1),给定的封闭可定义子集X[Rñ, 我们发现 [R=[R 这样,如果 GX[R 是可定义的,并延伸到 C[R 功能开启 [Rñ,然后有一个 C 可定义的扩展名。

更新日期:2021-05-07
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