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

 Бакоев, Валентин (2018) Ordinances of the vectors of the n-dimensional Boolean cube in accordance with their weights Book of Abstracts of 14SMAK, Kragujevac, Serbia, May 16 – 19, 2018, p. 103; ISBN 978-86-6009-055-5; https://imi.pmf.kg.ac.rs/kongres Резюме / Abstract  The problem "Given a Boolean function f of n variables by its Truth Table vector, denoted by TT(f). Find (if exists) a vector $\alpha \in \{0,1\}^n$ of minimal (or maximal) 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 (for example, in generating all subsets of a given set in accordance with their cardinalities, or in generating combinations etc.). 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". We enumerate the maximum chains for both relations. 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:   Доклад Ключови думи:  Boolean cube, binary vector, serial number, weight, relation, lexicographic order, weight order, maximum chain enumerating, sequence, weight-lexicographic order generating 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:   21254 Автор:  Валентин Бакоев

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