핵심 개념
The function f2(n) is strictly increasing in oriented graphs with weak diameter at most 2.
초록
The article discusses the function f2(n) in oriented graphs with weak diameter 2, focusing on its minimum arc counting. It explores the relationship between oriented cliques and oriented coloring, providing insights into the behavior and bounds of the function. The study aims to improve the upper bound of f2(n) and conjectures its exact value.
Introduction
Definition of the function hd(n, k)
Introduction to the function fd(n) for oriented graphs
Relation with Oriented Coloring
Definition of oriented homomorphisms and chromatic number
Absolute oriented cliques as objects of interest
Bounds of f2(n)
Historical background and previous attempts to determine f2(n)
Theorems providing bounds for f2(n)
Motivation and Contributions
Proving the strict increasing nature of f2(n)
Conjecturing the exact value of f2(n) and improving upper bounds
Organization
Structure of the article and sections
통계
Theorem 1.3 (Katona and Szemerédi [13]): n/2 log2(n/2) ≤ f2(n) ≤ n⌈log2(n)⌉
Theorem 1.4 (Füredi, Horak, Pareek and Zhu [11]): (1 - o(1))n log2(n) ≤ f2(n) ≤ n log2(n) - 3/2n
Theorem 1.5 (Kostochka, Luczak, Simonyi and Sopena [16]): n(logd n - 4 logd logd n - 5) ≤ fd(n) ≤ ⌈logd n⌉(n - ⌈logd n⌉)
Theorem 1.6 (Füredi, Horak, Pareek and Zhu [11] and Kostochka, Luczak, Simonyi and Sopena [16]): lim(n→∞) f2(n) / (n log2(n)) = 1
인용구
"In this article, we observe that the oriented graphs with weak diameter at most 2 are precisely the absolute oriented cliques."