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A novel code for the approximate computation of long-range forces between N mutually interacting bodies is presented. The code is based on a hierarchical tree of cubic cells and features mutual cell-cell interactions which are calculated…

天体物理学 · 物理学 2009-11-07 Walter Dehnen

We prove almost sure convergence of the maximum degree in an evolving tree model combining local choice and preferential attachment. At each step in the growth of the graph, a new vertex is introduced. A fixed, finite number of possible…

概率论 · 数学 2014-03-19 Yury Malyshkin , Elliot Paquette

Tree-based methods are powerful nonparametric techniques in statistics and machine learning. However, their effectiveness, particularly in finite-sample settings, is not fully understood. Recent applications have revealed their surprising…

统计理论 · 数学 2024-10-04 Hengrui Luo , Meng Li

Every encoding has priori information if the encoding represents any semantic information of the unverse or object. Encoding means mapping from the unverse to the string or strings of digits. The semantic here is used in the model-theoretic…

人工智能 · 计算机科学 2009-03-24 Xiuli Wang

Let ${\rm Z}(G)$ and ${\rm gp}(G)$ be the zero forcing number and the general position number of a graph $G$, respectively. Known results imply that ${\rm gp}(T)\ge {\rm Z}(T) + 1$ holds for every nontrivial tree $T$. It is proved that the…

组合数学 · 数学 2021-12-21 Hongbo Hua , Xinying Hua , Sandi Klavžar

The class of self-nested trees presents remarkable compression properties because of the systematic repetition of subtrees in their structure. In this paper, we provide a better combinatorial characterization of this specific family of…

数据结构与算法 · 计算机科学 2018-10-26 Romain Azaïs , Jean-Baptiste Durand , Christophe Godin

Arthur Cayley famously proved that there are n to the power n-2 labeled trees on n vertices. Here we go much further and show how to enumerate, fully automatically, labeled trees such that every vertex has a number of neighbors that belongs…

组合数学 · 数学 2022-02-22 Shalosh B. Ekhad , Doron Zeilberger

We give a simple characterisation of the distribution of the independence number, and equivalently the matching number, of a random tree on $n$ labelled vertices chosen uniformly among the $n^{n-2}$ such trees: Roll an $n$-sided die…

组合数学 · 数学 2021-06-07 Johan Wästlund

The structure of an evolving network contains information about its past. Extracting this information efficiently, however, is, in general, a difficult challenge. We formulate a fast and efficient method to estimate the most likely history…

物理与社会 · 物理学 2020-09-16 Gábor Timár , Rui A. da Costa , Sergey N. Dorogovtsev , José F. F. Mendes

These notes provide an introduction to the theory of localization for triangulated categories. Localization is a machinery to formally invert morphisms in a category. We explain this formalism in some detail and we show how it is applied to…

范畴论 · 数学 2009-03-14 Henning Krause

We study a variant of the Localization game in which the cops have limited visibility, along with the corresponding optimization parameter, the $k$-visibility localization number $\zeta_k$, where $k$ is a non-negative integer. We give…

组合数学 · 数学 2023-11-06 Anthony Bonato , Trent G. Marbach , John Marcoux , JD Nir

We analyze identifiability as a possible explanation for the ubiquity of linear properties across language models, such as the vector difference between the representations of "easy" and "easiest" being parallel to that between "lucky" and…

机器学习 · 统计学 2025-03-18 Emanuele Marconato , Sébastien Lachapelle , Sebastian Weichwald , Luigi Gresele

We consider here the problem of chaining seeds in ordered trees. Seeds are mappings between two trees Q and T and a chain is a subset of non overlapping seeds that is consistent with respect to postfix order and ancestrality. This problem…

定量方法 · 定量生物学 2015-05-19 Julien Allali , Cédric Chauve , Pascal Ferraro , Anne-Laure Gaillard

Packing graphs is a combinatorial problem where several given graphs are being mapped into a common host graph such that every edge is used at most once. In the planar tree packing problem we are given two trees T1 and T2 on n vertices and…

计算几何 · 计算机科学 2016-03-28 Markus Geyer , Michael Hoffmann , Michael Kaufmann , Vincent Kusters , Csaba D. Tóth

When studying the properties of a ring $R$, it is often useful to compare $R$ to other rings whose properties are already known. In this paper, we define three ways in which a subring $R$ might be compared to a larger ring $T$: being…

交换代数 · 数学 2025-07-03 Grant Moles

A space is `n-strong arc connected' (n-sac) if for any n points in the space there is an arc in the space visiting them in order. A space is omega-strong arc connected (omega-sac) if it is n-sac for all n. We study these properties in…

一般拓扑 · 数学 2012-09-26 Benjamin Espinoza , Paul Gartside , Merve Kovan-Bakan , Ana Mamatelashvili

A variant of Turing machines is introduced where the tape is replaced by a single tree which can be manipulated in a style akin to purely functional programming. This yields two benefits: first, the extra structure on the tape can be…

计算机科学中的逻辑 · 计算机科学 2015-07-17 Arnaud Spiwack

n-tuple power law widely exists in language, computer program code, DNA and music. After a vast amount of Zipf analyses of n-tuple power law from empirical data, we propose a model to explain the n-tuple power law feature existed in these…

数据分析、统计与概率 · 物理学 2009-08-05 Xiaocong Gan , Dahui Wang , Zhangang Han

We investigate a network growth model in which the genealogy controls the evolution. In this model, a new node selects a random target node and links either to this target node, or to its parent, or to its grandparent, etc; all nodes from…

统计力学 · 物理学 2010-06-04 E. Ben-Naim , P. L. Krapivsky

We prove various iteration theorems for forcing classes related to subproper and subcomplete forcing, introduced by Jensen. In the first part, we use revised countable support iterations, and show that 1) the class of subproper,…

逻辑 · 数学 2025-04-16 Gunter Fuchs , Corey Bacal Switzer