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Appendix D Definitions

Definition 2.3 Euler's formula
Definition 2.4 Analytic Continuation
Definition 8.1 Vector Space
Definition 8.2 Inner Product
Definition 8.6 Linear Operator
Definition 9.1 Differential Equations
Definition 9.2 Linearity and Homogeneity
Definition 9.3 Solution (of a differential equation)
Definition 9.4 Initial and Boundary Value Problems
Definition 9.5 Forms of First-Order ODEs
Definition 9.10 Ansatz
Definition 9.11 Characteristic Polynomial Equation
Definition 9.13 Linear Independence of Functions
Definition 9.16
Definition A.1 The Quadratic Formula
Definition A.2 Degeneracy