Results 21 to 30 of about 57,815 (333)

Feedforward–Feedback Controller Based on a Trained Quaternion Neural Network Using a Generalised HR Calculus with Application to Trajectory Control of a Three-Link Robot Manipulator

open access: yesMachines, 2022
This study derives a learning algorithm for a quaternion neural network using the steepest descent method extended to quaternion numbers. This applies the generalised Hamiltonian–Real calculus to obtain derivatives of a real–valued cost function ...
Kazuhiko Takahashi   +2 more
doaj   +1 more source

Quaternion-Type Catalan Transforms of the ρ-Fibonacci and ρ-Lucas Numbers

open access: yesJournal of Mathematics, 2023
In this paper, we define a new sequence called the quaternion-type Catalan sequence and give generating function, exponential representation, quaternionic Catalan matrix and its some properties.
Kübra Gül
doaj   +1 more source

Quaternion lattices and quaternion fields

open access: yesArchiv der Mathematik, 2023
AbstractLet $$Q_8$$ Q 8 be the quaternion group of order 8 and $${\chi }$$ χ its faithful irreducible character. Then $${\chi }$$ χ can be realized over certain imaginary quadratic number ...
openaire   +2 more sources

Predicting Rigid Body Dynamics Using Dual Quaternion Recurrent Neural Networks With Quaternion Attention

open access: yesIEEE Access, 2022
We propose a novel neural network architecture based on dual quaternions which allow for a compact representation of information with a main focus on describing rigid body movements.
Johannes Poppelbaum, Andreas Schwung
doaj   +1 more source

Eigenvalues of the basic Dirac operator on quaternion-Kahler foliations [PDF]

open access: yes, 2006
In this paper, we give an optimal lower bound for the eigenvalues of the basic Dirac operator on a quaternion-Kahler foliation. The limiting case is characterized by the existence of quaternion-Kahler Killing spinors.
Habib, Georges
core   +4 more sources

Quaternion Approach to the Measurement of the Local Birefringence Distribution in Optical Fibers

open access: yesIEEE Photonics Journal, 2015
A method to structure the Jones quaternion utilizing Pauli matrices is proposed, improving the quaternion theory of polarization optics. It is proved that the Stokes quaternion is the double product of the Jones quaternion and its Hermitian transpose and
Lanlan Liu   +4 more
doaj   +1 more source

Quaternion Hermitian Planes [PDF]

open access: yesResults in Mathematics, 1993
The quaternion hermitian planes are defined, and are characterized by certain groups of automorphisms. For this purpose, characterizations of locally compact connected translation planes (in the context of stable planes) and compact connected projective desarguesian planes are given.
openaire   +3 more sources

Rotacija z enotskim kvaternionom ( = Rotation with unit quaternion) [PDF]

open access: yesGeodetski Vestnik, 2014
A quaternion is a hyper-complex number. A rule for quaternion multiplications allows us to use it as a rotation in three-dimensional space. The aim of this article is to present quaternion rotations to the Slovene professional geodetic public ...
Klemen Kregar   +2 more
doaj   +1 more source

Quaternionic wave function [PDF]

open access: yesInternational Journal of Modern Physics A, 2019
We argue that quaternions form a natural language for the description of quantum-mechanical wave functions with spin. We use the quaternionic spinor formalism which is in one-to-one correspondence with the usual spinor language. No unphysical degrees of freedom are admitted, in contrast to the majority of literature on quaternions.
openaire   +2 more sources

Quaternion Algebras and Generalized Fibonacci–Lucas Quaternions [PDF]

open access: yesAdvances in Applied Clifford Algebras, 2015
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Flaut, Cristina, Savin, Diana
openaire   +1 more source

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