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[5] viXra:2311.0090 [pdf] submitted on 2023-11-19 11:40:07
Authors: Carlos Castro
Comments: 14 Pages.
One of the consequences of Fermat's last theorem is the existence of a countable infinite number of rational points on the unit circle, which allows in turn, to find the rational points on the unit sphere via the inverse stereographic projection of the homothecies of the rational points on the unit circle. We proceed to iterate this process and obtain the rational points on the unit $S^3$ via the inverse stereographic projection of the homothecies of the rational points on the previous unit $S^2$. One may continue this iteration/recursion process ad infinitum in order to find the rational points on unit hyper-spheres of arbitrary dimension $S^4, S^5, cdots, S^N$. As an example, it is shown how to obtain the rational points of the unit $ S^{24}$ that is associated with the Leech lattice. The physical applications of our construction follow and one finds a direct relation among the $N+1$ quantum states of a spin-N/2 particle and the rational points of a unit $S^N$ hyper-sphere embedded in a flat Euclidean $R^{N+1}$ space.
Category: Geometry
[4] viXra:2311.0088 [pdf] submitted on 2023-11-20 01:46:13
Authors: Andrey VORON
Comments: 3 Pages.
Possible variants of the equality of the values of the area and perimeter of a number of two—dimensional figures (square, circle, rectangular, obtuse and equilateral triangles), volume and area - three-dimensional (Platonic bodies, cone, cylinder, pyramid and sphere) are considered.
Category: Geometry
[3] viXra:2311.0084 [pdf] submitted on 2023-11-18 17:54:05
Authors: Ryan J. Buchanan
Comments: 6 Pages.
For a space of directed currents, geometric data may be accessible by means of a certain $frac{1}{n}$-type functor on a sheaf of germs. We investigate pointwise periodic homeomorphisms and their connections to foliations.
Category: Geometry
[2] viXra:2311.0069 [pdf] submitted on 2023-11-12 18:33:05
Authors: Mauricio Cele Lopez Belon
Comments: 10 Pages.
In recent years the As-Rigid-As-Possible with Smooth Rotations (SR-ARAP [5]) technique has gained popularity in applications where an isometric-type of surface mapping is needed. The advantage of SR-ARAP is that quality of deformation results is comparable to more costly volumetric techniques operating on tetrahedral meshes. The SR-ARAP relies on local/global optimisation approach to minimise the non-linear least squares energy. The power of this technique resides on the local step. The local step estimates the local rotation of a small surface region, or cell, with respect of its neighbouring cells, so a local change in one cell’s rotation affect the neighbouring cell’s rotations and vice-versa. The main drawback of this technique is that the local step requires a global convergence of rotation changes. Currently the local step is solved in an iterative fashion, where the number of iterations needed to reach convergence can be prohibitively large and so, in practice, only a fixed number of iterations is possible. This trade-off is, in some sense, defeating the goal of SR-ARAP. We propose a linear-time closed-form solution for estimating the codependent rotations of the local step by solving a sparse linear system of equations. Our method is more efficient than state-of-the-art since no iterations are needed and optimised sparse linear solvers can be leveraged to solve this step in linear time. It is also more accurate since this is a closed-form solution. We apply our method to generate interactive surface deformation, we also show how a multiresolution optimisation can be applied to achieve real-time animation of large surfaces.
Category: Geometry
[1] viXra:2311.0035 [pdf] submitted on 2023-11-08 02:58:04
Authors: Ryan J. Buchanan
Comments: 6 Pages.
In this brief note, we discuss projective morphisms of perfect categories which are fully faithful, i.e., totally lossless.
Category: Geometry
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