## About the ordinances of the vectors of the n-dimensional Boolean cube in accordance with their weights

 Бакоев, Валентин (2018) About the ordinances of the vectors of the n-dimensional Boolean cube in accordance with their weights Cornell University Library, https://arxiv.org/abs/1811.04421 Резюме / Abstract  The problem ''Given a Boolean function f of n variables by its truth table vector. Find (if exists) a vector $\alpha \in \{0,1\}^n$ of maximal (or minimal) weight, such that $f(\alpha)= 1$.'' arises in computing the algebraic degree of Boolean functions or vectorial Boolean functions called S-boxes. The solutions to this problem have useful generalizations and applications. To find effective solutions we examine the ways of ordering the vectors of the Boolean cube in accordance with their weights. The notion ''k-th layer'' of the n-dimensional Boolean cube is involved in the definition and examination of the ''weight order'' relation. It is compared with the known relation ''precedes''. The maximum chains for both relations are enumerated. An algorithm that generates the vectors of the n-dimensional Boolean cube in accordance with their weights is developed. The lexicographic order is chosen as a second criterion for an ordinance of the vectors of equal weights. The algorithm arranges the vectors in a unique way called a weight-lexicographic order. It is represented by the serial numbers of the vectors, instead of the vectors itself. Its time and space complexities are $\Theta (2^n)$, i.e., of linear type with respect to the size of the output. The obtained results are summarized and added as a new sequence (A294648) in the OEIS. Вид:   Статия Ключови думи:  Boolean cube, binary vector, serial number, lexicographic order, weight order, maximum chains enumerating, weight-lexicographic order generating, power set generating, ranking Области: Природни науки, математика и информатика Природни науки, математика и информатика Информатика и компютърни науки Subjects: Natural sciences, mathematics and informatics Natural sciences, mathematics and informatics Informatics and Computer Science Статус:  Издадено Идентификационен номер:   22586 Автор:  Валентин Бакоев

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