typora shortcuts ，二十四个希腊字母

typora shortcuts

https://support.typora.io/Shortcut-Keys/#change-shortcut-keys

the sum of two vectors

$$a+b$$

a table

$$\begin{array}{cl}1sssssss& a\\ 3& 4\\ a& \text{55}\\ \begin{array}{ll}a& d\\ a& g\end{array}& f\end{array}$$

Greek Letters

$$\begin{array}{clclclclcl}\mathrm{A}\to \alpha & alpha& \mathrm{B}\to \beta & beta& \Gamma \to \gamma & gamma& \Delta \to \delta & delta& \mathrm{E}\to ϵ& epsilon\\ \mathrm{Z}\to \zeta & zeta& \mathrm{H}\to \eta & eta& \Theta \to \theta & theta& \mathrm{I}\to \iota & iota& \mathrm{K}\to \kappa & kappa\\ \Lambda \to \lambda & lambda& \mathrm{M}\to \mu & mu& \mathrm{N}\to \nu & nu& \Xi \to \xi & xi& \mathrm{O}\to o& omicron\\ \Pi \to \pi & pi& \mathrm{P}\to \rho & rho& \Sigma \to \sigma & sigma& \mathrm{T}\to \tau & tau& {\rm Y}\to \upsilon & upsilon\\ \Phi \to \varphi & phi& \mathrm{X}\to \chi & chi& \Psi \to \psi & psi& \Omega \to \omega & omega& & \end{array}$$

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