# HackMD語法
1. $A_B$ = A_B
2. A^B^ = A^B^
3. $\sqrt{2}$ = \sqrt{2}
4. ${b \over a}$ = {b \over a}
5. $A \to B$ = A \to B
6. $\bar{a}$ = \bar{a}
7. $\mu$ = \mu
8. $\epsilon$ = \epsilon
9. $\lambda$ = \lambda
10. $\displaystyle\sum_{k=1}^{N}x(t_k)$ = \displaystyle\sum_{k=1}^{N}x(t_k)
11. $\dfrac{分子}{分母}$ = \dfrac{分子}{分母}
12. $A\times B$ = A\times B
13. $a\cdot b$ = a\cdot b
14. $\div$ = \div
15. $\partial$ = \partial
16. $\oplus$ = \oplus
17. $\gt$ = \gt
18. $\lt$ = \lt
19. $\ge$ = \ge
20. $\le$ = \le
21. $\ne$ = \ne
22. $\approx$ = \approx
23. $\sim$ = \sim
24. $\cong$ = \cong
25. $\ll$ = \ll, much less than
26. $\gg$ = \gg, much greater than
27. $\nless$ = \nless, not less than
28. $\ngtr$ = \ngtr, not greater than
29. $\subset$ = \subset, or implied
30. $\supset$ = \superset, or implies
31. $\subseteq$ = \subseteq
32. $\supseteq$ = \supseteq

註解用:跟html語法相容
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[List of Logic Symbols](https://en.wikipedia.org/wiki/List_of_logic_symbols)

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## 程式語法凸顯(syntax highlight)

# 這個是輸入原始碼的區塊，可以用下面的語法：

expression

    
# 另外在大括號中可以填入您想要使用的語言，
# 此時 hackmd 就會依照該語言的語法，使用語法凸顯(syntax highlight)
# 讓您容易閱讀，例如：

myFunc <- function(){
print("Hello World!")
}

## 重點標示換顏色
<style> .red {color:red;} </style>
### <span class ="red">如果這邊有用到＜這:個＞</span>:＜＞要用全形