Results 11 to 20 of about 1,418,478 (304)
Product-free sets in the free semigroup [PDF]
European Journal of Combinatorics, 2020 In this paper, we study product-free subsets of the free semigroup over a finite alphabet $A$. We prove that the maximum density of a product-free subset of the free semigroup over $A$, with respect to the natural measure that assigns a weight of $|A|^{-n}$ to each word of length $n$, is precisely $1/2$.
Imre Leader +3 more
openaire +6 more sources
Product-free sets in the free group
Proceedings of the 12th European Conference on Combinatorics, Graph Theory and Applications, 2023 We prove that product-free sets of the free group over a finite alphabet have maximum density $1/2$ with respect to the natural measure that assigns total weight one to each set of irreducible words of a given length. This confirms a conjecture of Leader, Letzter, Narayanan and Walters. In more general terms, we actually prove that strongly $k$-product-
Ortega Sánchez Colomer, Miquel +2 more
core +8 more sources
On compactifications and product‐free sets [PDF]
Journal of the London Mathematical Society, 2019 A subset of a group is said to be product-free if it does not contain three elements satisfying the equation $xy=z$. We give a negative answer to a question of Babai and Sós on the existence of large product-free sets by model theoretic means. This question was originally answered by Gowers. Furthermore, we give a natural and sufficient model theoretic
Palacín, Daniel, Palacín Cruz, Daniel
openaire +4 more sources
Streptomyces cell-free systems for natural product discovery and engineering [PDF]
, 2022 Streptomyces bacteria are a major microbial source of natural products, which are encoded within so-called biosynthetic gene clusters (BGCs). This highlight discusses the emergence of native Streptomyces cell-free systems as a new tool to accelerate the ...
Lai, H-E +7 more
core +1 more source
"Download for Free" - When Do Providers of Digital Goods Offer Free Samples? [PDF]
, 2004 In a monopoly setting where consumers cannot observe the quality of the product we show that free samples which are of a lower quality than the marketed digital goods are used together with high prices as signals for a superior quality if the number of ...
Boom, Anette
core +4 more sources
THE MAIN SCENARIOS FOR THE DEVELOPMENT OF ATMOSPHERIC-ELECTRIC VARIATIONS IN THE SURFACE ATMOSPHERE DURING SEVERE FROSTS IN SIBERIA [PDF]
Vestnik KRAUNC: Fiziko-Matematičeskie Nauki, 2019 The influence of strong temperature drops in the cold season, which are accompanying by fogs (smogs), on the meteorological and atmospheric-electric state of the atmosphere surface layer in Siberia was considered.
V. I. Kozlov +4 more
doaj +1 more source
Product Market Competition, Free Cash Flow, Over Investment and Low Investment [PDF]
مطالعات تجربی حسابداری مالی, 2016 The goal of this paper is to examine the association between product marketcompetition and corporate investment decisions on particularly, over investment and low investment. The managers have different incentives to keep cash in firms.
Seyed Kazem Ebrahimi +2 more
doaj +3 more sources
Boolean Algebras with Semigroup Operators: Free Product and Free Objects
Journal of Mathematics, 2023 Two important algebraic structures are S-acts and Boolean algebras. Combining these two structures, one gets S-Boolean algebras, equipped with a compatible right action of a monoid S which is a special case of Boolean algebras with operators.
H. Barzegar
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ОСОБЕННОСТИ МАШИННОГО ИССЛЕДОВАНИЯ ДИСКРЕТНЫХ ГРУПП
Vestnik KRAUNC: Fiziko-Matematičeskie Nauki, 2013 В статье демонстрируются особенности машинного исследования внутреннего строения конечных и бесконечных дискретных групп.
А.П. Горюшкин, A.P. Goryushkin
doaj +1 more source
HILIC-MS for Untargeted Profiling of the Free Glycation Product Diversity
Metabolites, 2022 Glycation products produced by the non-enzymatic reaction between reducing carbohydrates and amino compounds have received increasing attention in both food- and health-related research.
Yingfei Yan +2 more
doaj +1 more source