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- W2967183730 abstract "In a recent paper, M. E. Kahoui and M. Ouali have proved that over an algebraically closed field $k$ of characteristic zero, residual coordinates in $k[X][Z_1,dots,Z_n]$ are one-stable coordinates. In this paper we extend their result to the case of an algebraically closed field $k$ of arbitrary characteristic. In fact, we show that the result holds when $k[X]$ is replaced by any one-dimensional seminormal domain $R$ which is affine over an algebraically closed field $k$. For our proof, we extend a result of S. Maubach giving a criterion for a polynomial of the form $a(X)W+P(X,Z_1,dots,Z_n)$ to be a coordinate in $k[X][Z_1,dots,Z_n,W]$. Kahoui and Ouali had also shown that over a Noetherian $d$-dimensional ring $R$ containing $Q$ any residual coordinate in $R[Z_1,dots,Z_n]$ is an $r$-stable coordinate, where $r=(2^d-1)n$. We will give a sharper bound for $r$ when $R$ is affine over an algebraically closed field of characteristic zero." @default.
- W2967183730 created "2019-08-22" @default.
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- W2967183730 date "2019-08-09" @default.
- W2967183730 modified "2023-09-27" @default.
- W2967183730 title "On Residual and Stable Coordinates" @default.
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