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Sets of range uniqueness for multivariate polynomials and linear functions with rank k
Linear and Multilinear Algebra ( IF 0.9 ) Pub Date : 2021-05-10 , DOI: 10.1080/03081087.2021.1922338
Lorenz Halbeisen 1 , Norbert Hungerbühler 1 , Salome Schumacher 1 , Guo Xian Yau 1
Affiliation  

Let F be a set of functions with a common domain X and a common range Y. A set SX is called a set of range uniqueness (SRU) for F, if for all f,gF, f[S]=g[S]f=g. Let Pn,k be the set of all real polynomials in n variables of degree at most k and let Lk(Rn,Rn) be the set of all linear functions f:RnRn with rank k. We show that there are SRU's for Pn,k of cardinality 2n+kk1, but there are no such SRU's of size 2n+kk2 or less. Moreover, we show that there are SRU's for Lk(Rn,Rn) of size 2n1if k=1,2nk+1if k>1, but there are no such SRU's of smaller size.



中文翻译:


多元多项式和秩为 k 的线性函数的范围唯一性集



F 是具有公共域X和公共值域Y的一组函数。一套 S X称为范围唯一性集 (SRU) F ,如果对于所有 f ,ε F , f [ S ] =[ S ] f = n , kn 个次数最多为k的变量中的所有实多项式的集合,令 L k n ,n 是所有线性函数的集合 f :n n等级为k 。我们证明有 SRU n , k基数的 2 n + k k - 1 ,但是没有这样大小的 SRU 2 n + k k - 2或更少。 此外,我们表明存在 SRU L k n ,n 尺寸的 2 n - 1f k = 1 , 2 n - k + 1f k > 1 ,但没有这样的更小尺寸的SRU。

更新日期:2021-05-10
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