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

J
Java Code Geeks
美团技术团队
Microsoft Azure Blog
Microsoft Azure Blog
V
Visual Studio Blog
Jina AI
Jina AI
博客园_首页
M
MIT News - Artificial intelligence
D
DataBreaches.Net
L
LangChain Blog
宝玉的分享
宝玉的分享
F
Fortinet All Blogs
A
About on SuperTechFans
月光博客
月光博客
Stack Overflow Blog
Stack Overflow Blog
Google DeepMind News
Google DeepMind News
N
Netflix TechBlog - Medium
Y
Y Combinator Blog
腾讯CDC
Vercel News
Vercel News
雷峰网
雷峰网
GbyAI
GbyAI
aimingoo的专栏
aimingoo的专栏
阮一峰的网络日志
阮一峰的网络日志
博客园 - 【当耐特】

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 $\mathbb{F}_{{p}^{m}}$
Smoothed Analysis of Order Types
Ivor van der Hoog, Tillmann Miltzow, Martijn van Schaik · 2019-07-10 · via math.CO updates on arXiv.org

Consider an ordered point set $P = (p_1,\ldots,p_n)$, its order type (denoted by $χ_P$) is a map which assigns to every triple of points a value in $\{+,-,0\}$ based on whether the points are collinear(0), oriented clockwise(-) or counter-clockwise(+). An abstract order type is a map $χ: \left[\substack{n\\3}\right] \rightarrow \{+,-,0\}$ (where $\left[\substack{n\\3}\right]$ is the collection of all triples of a set of $n$ elements) that satisfies the following condition: for every set of five elements $S\subset [n]$ its induced order type $χ_{|S}$ is realizable by a point set. To be precise, a point set $P$ realizes an order type $χ$,if $χ_P(p_i,p_j,p_k) = χ(i,j,k)$, for all $i<j<k$. Planar point sets are among the most basic and natural geometric objects of study in Discrete and Computational Geometry. Properties of point sets are relevant in theory and practice alike. It is known, that deciding if an abstract order type is realizable is complete for the existential theory of the reals. Our results show that order type realizability is much easier for realistic instances than in the worst case. In particular, we can recognize instances in "expected \NP-time". This is one of the first $\exists\mathbb{R}$-complete problems analyzed under the lens of Smoothed Analysis.