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四元数体上微分方程理论已经在微分方程定性与稳定性研究中发挥着重要的作用，并以其丰富的理论思想和复杂的数学技巧应用到数学的各个研究领域之中，《四元数体上微分方程的理论及其应用（英文）》总结国内外知名学者的研究成果下，作者根据几年来在这方面的研究总结，把一些**的研究进展和新成果介绍给广大读者，希望读者能进一步了解它。目前国际上没有一本关于四元数体上微分方程的著作。
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Contents
Preface
Athors’ biography
Chapter 1 Background of Quaternion and Quaternion-valued Differential Equations 1
1.1 Background for quaternions 1
1.2 Background for QDEs 5
1.2.1 Quaternion Frenet frames in differential geometry 5
1.2.2 QDEs appears in kinematic modelling and attitude dynamics 6
1.2.3 QDE appears in fluid mechanics 8
1.2.4 QDE appears in quantum mechanics 8
1.3 History and motivation of our research 9
Chapter 2 Preliminary Concepts and Notations 12
2.1 Quaternion algebra 12
2.2 Biquaternion algebra 14
2.3 Definitions of determinants 15
2.4 Groups， rings， modules 17
2.5 Existence and uniqueness of solution to QDEs 20
Chapter 3 Basic Theory of Linear Homogeneous Quaternion-valued Differential Equations 22
3.1 Structure of general solutions for 2D QDEs 22
3.2 Structure of general solutions for any finite dimensional QDEs based on permutation 30
3.3 Fundamental matrix and solution to QDEs 40
3.4 Algorithm for computing fundamental matrix 47
3.4.1 Method 1: using expansion of exp{At} 48
3.4.2 Method 2: eigenvalue and eigenvector theory 51
Chapter 4 Algorithm for Linear Homogeneous QDEs when Linear Homogeneous System Has Multiple Eigenvalues 55
4.1 Motivations 55
4.2 Solving linear homogenous QDEs when linear homogeneous system has multiple eigenvalues 56
4.2.1 Multiple eigenvalues with enough eigenvectors 56
4.2.2 Multiple eigenvalues with fewer eigenvectors 58
Chapter 5 Floquet Theory of Quaternion-valued Differential Equations 66
5.1 Preliminary results 67
5.2 Stability of linear homogeneous QDEs with constant coefficients 70
5.3 Floquet theory for QDEs 75
5.4 Quaternion-valued Hill’s equations 84
Chapter 6 Solve Linear Nonhomogeneous Quaternion-valued Differential Equations 88
6.1 Notations 88
6.2 Main results 90
6.3 Some examples 92
Chapter 7 Linear Quaternion Dynamic Equations on Time Scale 97
7.1 Notations and preliminary results 98
7.1.1 Notations and lemmas 98
7.1.2 Calculus on time scales 100
7.2 First order linear QDETS 103
7.3 Linear systems of QDETS 109
7.4 Linear QDETS with constant coefficients 119
Chapter 8 Laplace Transform: a New Approach in Solving Linear Quaternion Differential Equations 129
8.1 Introduction 129
8.2 Biquaternion algebra 130
8.2.1 Biquaternion exponential function 131
8.2.2 Fundamental theorem of quaternion algebra and factorization theorem revisited 134
8.3 Definition and properties of the Laplace transform in biquaternion domain 134
8.4 Using QLT to solve QDEs 144
Chapter 9 Solving Quaternion Differential Equations with Two-sided Coefficients 150
9.1 Introduction 150
9.2 Notations and preliminary results 151
9.3 Solving QDEs with unilateral coefficients 152
9.4 Solving QDEs with two-sided coefficients 160
9.4.1 Homogeneous linear QDEs with two-sided coefficients 160
9.4.2 Nonhomogeneous linear QDEs with two-sided coefficients 168
Chapter 10 Controllability and Observability of Linear Quaternionvalued Systems 172
10.1 Motivations 172
10.2 Notations and preliminary results 174
10.3 Main results on the controllability and observability of linear QVS 178
10.3.1 Controllability 178
10.3.2 Observability 183
10.3.3 Duality 187
Chapter 11 Stability Analysis of Quaternion-valued Neural Networks 190
11.1 Notations and preliminary results 190
11.2 Main results 197
11.3 Examples 205
Chapter 12 Convex Function Optimization Problems with Quaternion Variables 209
12.1 Notations and preliminary results 210
12.1.1 Quaternion algebra analysis 210
12.1.2 Generalized gradient 213
12.2 Main results on the convex function optimization problems with quaternion variables 217
12.3 Examples and simulations 230
12.4 Proof of the Proposition 12.1.4 232
Chapter 13 Penalty Method for Constrained Distributed Quaternionvariable Optimization 236
13.1 Introduction 236
13.2 Preliminaries 238
13.3 Main results 245
13.4 An example 250
Bibliography 253
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