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
Let be a set of functions with a common domain X and a common range Y. A set is called a set of range uniqueness (SRU) for , if for all , Let be the set of all real polynomials in n variables of degree at most k and let be the set of all linear functions with rank k. We show that there are SRU's for of cardinality , but there are no such SRU's of size or less. Moreover, we show that there are SRU's for of size 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
让 是具有公共域X和公共值域Y的一组函数。一套