scholarly journals On the induced distribution of the shape of the projection of a randomly rotated configuration

2010 ◽  
Vol 42 (02) ◽  
pp. 331-346
Author(s):  
H. Le ◽  
D. Barden

Using the geometry of the Kendall shape space, in this paper we study the shape, as well as the size-and-shape, of the projection of a configuration after it has been rotated and, when the given configuration lies in a Euclidean space of an arbitrary dimension, we obtain expressions for the induced distributions of such shapes when the rotation is uniformly distributed.

2010 ◽  
Vol 42 (2) ◽  
pp. 331-346
Author(s):  
H. Le ◽  
D. Barden

Using the geometry of the Kendall shape space, in this paper we study the shape, as well as the size-and-shape, of the projection of a configuration after it has been rotated and, when the given configuration lies in a Euclidean space of an arbitrary dimension, we obtain expressions for the induced distributions of such shapes when the rotation is uniformly distributed.


2018 ◽  
Vol 33 (35) ◽  
pp. 1850209
Author(s):  
A. L. Pismensky

The [Formula: see text]-theory in the Euclidean space of arbitrary dimension is considered in the present paper. The method of [Formula: see text]-expansion in frames of conformal bootstrap equations is used. As one knows, there is an [Formula: see text]-expansion technique that allows one to calculate the critical exponent in the form of a series in [Formula: see text], the deviation of the space dimension from the logarithmic one. However, the given series in [Formula: see text] is divergent, and it is not possible to extend it analytically to arbitrary dimension. To solve the problem, we propose using the [Formula: see text]-expansion: we construct series in powers of the Fisher’s exponent [Formula: see text] or a parameter [Formula: see text] expressed through the Fisher’s exponent and we obtain some approximate equation for [Formula: see text] or [Formula: see text].


2021 ◽  
pp. 3-12
Author(s):  
A. Girsh

The Euclidean plane and Euclidean space themselves do not contain imaginary elements by definition, but are inextricably linked with them through special cases, and this leads to the need to propagate geometry into the area of imaginary values. Such propagation, that is adding a plane or space, a field of imaginary coordinates to the field of real coordinates leads to various variants of spaces of different dimensions, depending on the given axiomatics. Earlier, in a number of papers, were shown examples for solving some urgent problems of geometry using imaginary geometric images [2, 9, 11, 13, 15]. In this paper are considered constructions of orthogonal and diametrical positions of circles on a complex plane. A generalization has been made of the proposition about a circle on the complex plane orthogonally intersecting three given spheres on the proposition about a sphere in the complex space orthogonally intersecting four given spheres. Studies have shown that the diametrical position of circles on the Euclidean E-plane is an attribute of the orthogonal position of the circles’ imaginary components on the pseudo-Euclidean M-plane. Real, imaginary and degenerated to a point circles have been involved in structures and considered, have been demonstrated these circles’ forms, properties and attributes of their orthogonal position. Has been presented the construction of radical axes and a radical center for circles of the same and different types. A propagation of 2D mutual orthogonal position of circles on 3D spheres has been made. In figures, dashed lines indicate imaginary elements.


Author(s):  
V. VARANO ◽  
S. GABRIELE ◽  
L. TERESI ◽  
I. DRYDEN ◽  
P. E. PUDDU ◽  
...  

2014 ◽  
Vol 114 (1) ◽  
pp. 86 ◽  
Author(s):  
A. Aytuna ◽  
A. Sadullaev

An open Riemann surface is called parabolic in case every bounded subharmonic function on it reduces to a constant. Several authors introduced seemingly different analogs of this notion for Stein manifolds of arbitrary dimension. In the first part of this note we compile these notions of parabolicity and give some immediate relations among these different definitions. In section 3 we relate some of these notions to the linear topological type of the Fréchet space of analytic functions on the given manifold. In section 4 we look at some examples and show, for example, that the complement of the zero set of a Weierstrass polynomial possesses a continuous plurisubharmonic exhaustion function that is maximal off a compact subset.


2017 ◽  
Vol 163 (3) ◽  
pp. 533-546 ◽  
Author(s):  
JOHANNES SCHLEISCHITZ

AbstractIn a paper from 2010, Budarina, Dickinson and Levesley studied the rational approximation properties of curves parametrised by polynomials with integral coefficients in Euclidean space of arbitrary dimension. Assuming the dimension is at least three and excluding the case of linear dependence of the polynomials together with P(X) ≡ 1 over the rational number field, we establish proper generalisations of their main result.


2014 ◽  
Vol 57 (3) ◽  
pp. 633-642 ◽  
Author(s):  
RAM SHANKAR GUPTA

AbstractThe following Chen's bi-harmonic conjecture made in 1991 is well-known and stays open: The only bi-harmonic submanifolds of Euclidean spaces are the minimal ones. In this paper, we prove that the bi-harmonic conjecture is true for bi-harmonic hypersurfaces with three distinct principal curvatures of a Euclidean space of arbitrary dimension.


1995 ◽  
Vol 27 (1) ◽  
pp. 44-55 ◽  
Author(s):  
Hulling Le

Unlike the means of distributions on a euclidean space, it is not entirely clear how one should define the means of distributions on the size-and-shape or shape spaces of k labelled points in ℝm since these spaces are all curved. In this paper, we discuss, from a shape-theoretic point of view, some questions which arise in practice while using procrustean methods to define mean size-and-shapes or shapes. We obtain sufficient conditions for such means to be unique and for the corresponding generalized procrustean algorithms to converge to them. These conditions involve the curvature of the size-and-shape or shape spaces and are much less restrictive than asking for the data to be concentrated.


1975 ◽  
Vol 12 (4) ◽  
pp. 817-823 ◽  
Author(s):  
Franz Streit

Randomly generated subsets of a point-set A0 in the k-dimensional Euclidean space Rk are investigated. Under suitable restrictions the probability is determined that a randomly located set which hits A0. is a subset of A0. Some results on the expected value of the measure and the surface area of the common intersection-set formed by n randomly located objects and A0 are generalized and derived for arbitrary dimension k.


2018 ◽  
Author(s):  
Wataru Yano ◽  
Naoko Egi ◽  
Tomo Takano ◽  
Naomichi Ogihara

AbstractIn order to investigate craniofacial size and three-dimensional shape variations independently in the Japanese macaque (Macaca fuscata) we used a geometric morphometries technique. A total of 55 specimens were CT scanned to generate a three-dimensional model of each cranium, and 57 landmarks were digitized to analyze the craniofacial shape variation in the Japanese macaque. The results showed that four intra-specific groups, consisting of two subspecies and the two sexes, differed in both size and shape space. In size, the cranium of the Macaca fuscata yakui (MFY) was smaller than that of Macaca fuscata fuscata (MFF) in both sexes, and female crania were smaller than male crania in both subspecies. Shape sexual dimorphisms in both subspecies were detected in the first axis of principal component analysis and were related to a relatively broad orbit, smaller neurocranium, enlarged snout, and broader temporal fossa in males. The shape differences between subspecies showed different features than those between sexes. Male subspecies shape differences were detected in the first and third axes, while those for females were in the first and second axes. Subspecies shape differences common to both sexes were a narrower orbit, relatively small neurocranium, longer snout, and postorbital constriction in MFY. Male MFY was specifically characterized by a more anterior and superior direction of snout protrusion. In contrast, female MFY showed an inferior direction of snout protrusion. Female MFY also had a taller orbit. With regard to the relationship between size and shape differences, shape sexual dimorphism for each subspecies was positively associated with size difference, but there was no such association between subspecies in either sex. Size does not seem to play an important role in subspeciation of Macaca fuscata.


Sign in / Sign up

Export Citation Format

Share Document