惯性聚合 高效追踪和阅读你感兴趣的博客、新闻、科技资讯
阅读原文 在惯性聚合中打开

推荐订阅源

腾讯CDC
IT之家
IT之家
有赞技术团队
有赞技术团队
WordPress大学
WordPress大学
Apple Machine Learning Research
Apple Machine Learning Research
OSCHINA 社区最新新闻
OSCHINA 社区最新新闻
人人都是产品经理
人人都是产品经理
The Cloudflare Blog
钛媒体:引领未来商业与生活新知
钛媒体:引领未来商业与生活新知
freeCodeCamp Programming Tutorials: Python, JavaScript, Git & More
博客园 - 【当耐特】
V
V2EX
Last Week in AI
Last Week in AI
H
Help Net Security
The GitHub Blog
The GitHub Blog
S
SegmentFault 最新的问题
F
Fortinet All Blogs
I
InfoQ
宝玉的分享
宝玉的分享
A
About on SuperTechFans
MongoDB | Blog
MongoDB | Blog
Microsoft Azure Blog
Microsoft Azure Blog
Blog — PlanetScale
Blog — PlanetScale
B
Blog

math.CO updates on arXiv.org

Complement Submodular Information Measures for Balanced and Robust Data Selection A Proof of a Conjecture on Positive and Negative Square Energies of Unicyclic Graphs Laplacian Spectrum of the Weakly Zero-Divisor Graph of a Finite Commutative Ring An identity for second Eulerian numbers via lattice-point counting $t$-tone edge coloring of graphs Constructing Maximal Bumpless Pipedreams for Double Grothendieck Polynomials Mubayi's Polynomial-Ideal Conjecture and Cover-Ideal Turán Methods Implicit Binarization via Complex Phase Dynamics in Combinatorial Optimization The limits of Schur multipliers in Pólya conversion problems for the $q$-permanent function Universality theorems for generalized splines Framing Triangulations for Arbitrary Integer Flow Polytopes On the Common Generalization of Gentle Algebras and Framed Directed Acyclic Graphs The complexity of frugal digraph homomorphisms Chaotic and periodic behavior of jeu de taquin on infinite Young tableaux Enumerating Pattern Avoiding Parking Functions Incidence toric ideals and three-point functions Unique Winning Opening Move in Three-Row Chomp Strong majority colorings of graphs A Balancing Theorem for Spanning Trees of Rectangular Grid Graphs Spectral radius and edge-disjoint connected factors of graphs New invariants for rank metric codes, with applications to the classification of rank two semifields of order 256 Flexible DP-4-coloring of planar graphs without 4-cycles and intersecting triangles Balanced intersection size distributions in projective planes List Reconstruction Problem with List Size Two Is Dimensionality a Barrier for Retrieval Models? The INIEP: Irreducible and Positive Realizations The number of Pfaffian orientations on punctured polygonally cellulated surfaces Explicit Construction of Polytopes whose Ehrhart Polynomials Realize any Given Sign Pattern Finite-state enumeration of adjacency-constrained 132-avoiding permutations AMDS and quantum AMDS Constacyclic codes of length $4p^ς$ over $\mathbb{F}_{{p}^{m}}$
Explicit geometric construction of Ramsey graphs
Matija Kocbek · 2025-07-12 · via math.CO updates on arXiv.org

We present an explicit geometric construction of a large parametrized family of graphs with no $k$-cliques and with bounded independence number, generalizing the triangle-free Ramsey graphs of Codenotti, Pudlák, and Resta and revisiting the previous generalization by Kostochka, Pudlák and Rödl. Within this framework, we provide a new combinatorial proof of the upper bound on the independence number for their constructions, offering additional insight into the structure of its independent sets. For our generalized family, we establish lower bounds on the independence number and identify necessary constraints on the parameters under which these graphs could yield improved constructive asymptotic lower bounds on $R(s,t)$, with particular emphasis on $R(3,t)$. As a byproduct, we provide a linear-time approximation algorithm for finding the largest independent set within this parametrized family. For a substantial subfamily, this algorithm achieves a $\frac{1}{2}$-approximation ratio. Special attention is given to the case of triangle-free graphs: we describe explicit constructions on $n$ vertices with independence number $O(n^{\frac{2}{3}})$, giving a constructive asymptotic lower bound of $Ω(t^{\frac{3}{2}})$ for the Ramsey numbers $R(3,t)$, matching the best known constructive bound.