نتایج جستجو برای: point primitive

تعداد نتایج: 558940  

Journal: :Discrete Mathematics 2001
Wenwen Tong Huiling Li

Let G be a solvable block transitive automorphism group of a 2− (v; 5; 1) design and suppose that G is not 0ag transitive. We will prove that (1) if G is point imprimitive, then v = 21, and G6 Z21 : Z6; (2) if G is point primitive, then G6A L(1; v) and v = p, where p is a prime number with p ≡ 21 (mod 40), and a an odd integer. c © 2002 Elsevier Science B.V. All rights reserved.

2016
Ananda Chandra Nayak Amit Kumar Srivastava Kalpesh Kapoor

A partial word is a word that may have some unknown places known as “holes” and can be replaced by the symbols from the underlying alphabet. A partial word u is said to be primitive if there does not exist a word v such that u is contained in a nontrivial integer power of v. We study the preservation of primitivity in partial words by the effect of some point mutation operations. In this paper,...

2004
Chiung-Shiuan Fu Jie Shan

This paper presents a model-based approach for 3-D building reconstruction unstructured distinct points. The data structure of a building is an unstructured roof point cloud digitized by operators. Constructive Solid Geometry (CSG) model is applied in our approach for a complex roof which can be decomposed into three types of primitive models. The primitive model is represented as a tree. The l...

Journal: :American Anthropologist 1947

Journal: :Computer-Aided Design 1992
H. K. Choi C. M. Kyung

The paper presents a new data structure called a shadow pyramid for storing 3D objects to reduce the shadow-testing time during ray tracing. For each primitive object that first intersects a ray, a shadow pyramid is constructed in which all the candidate objects that possibly block the path from the relevant light source to any point on the primitive object are registered. Shadow testing of. th...

Journal: :Physical review research 2022

We show with first-principles molecular dynamics the persistence of intrinsic $\langle111\rangle$ Ti off-centerings for BaTiO$_3$ in its cubic paraelectric phase. Intriguingly, these are inconsistent Pm$\bar 3$m space group often used to atomistically model this phase using density functional theory or similar methods. Therefore we deploy a systematic symmetry analysis construct representative ...

2004
Yen-Mei J. Chen Jing Yu

Let E be an elliptic curve defined over Q and P ∈ E(Q) a rational point of infinite order. Suppose that E has complex multiplication by an order in the quadratic imaginary field k. Denote by ME,P the set of rational primes ` such that ` splits in k, E has good reduction at `, and P is a primitive point modulo `. Under the generalized Riemann hypothesis, we can determine the positivity of the de...

2008
BERND SING

We consider (generalized) Kolakoski sequences on an alphabet with two even numbers. They can be related to a primitive substitution rule of constant length l. Using this connection, we prove that they have pure point dynamical and pure point diffractive spectrum, where we make use of the strong interplay between these two concepts. Since these sequences can then be described as model sets with ...

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