0 Eular Equation \(\begin{aligned} e^{i\theta}&=\cos\theta+i\sin\theta \\ e^{-i\theta}&=\cos\theta-i\sin\theta \\ \cos\theta&=\frac{e^{i\theta}+e^{-i\theta}}{2} \\ \sin\theta&=\frac{ie^{-i\theta}-ie^{i\theta}}{2} \end{aligned}\)
P4
D7 D7.2
P1 对于 $Ax=b$ 的解的可能性 ($A_{m\times n},b_{m\times 1}$)
DH1 1.1 Schwarz Inequality \(\|\bf{w}\|\geq(\bf{v}\cdot\bf{w})/\|\bf{v}\|\)
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L1 Def 2: 点乘 Dot Product $x\cdot y=x^T y=\sum_{i=1}^n x_i y_i$ $x\cdot y=y\cdot x$ For $x,y\in\mathbb{R}^n$, 但对于 $x,y\in \mathbb{C}^n$ 点乘的定义将变化
![[Snipaste_2023-05-17_09-37-22 1.png]]