有三四周的课没听……基本就是一个速成版速成笔记

Ch1 Introduction

Differential Equations and Basic Concepts

• linear, nonlinear
• order
• homogeneous, have constant coefficients
• THM: All ODEs can be equivalently described by a system of 1st-order ODE.
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    \(\Leftrightarrow\)
    
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    \(\Leftrightarrow\)