$$ ot |$$
$$infty$$
$$Alpha - Alpha - alpha$$
$$Beta - Beta - eta$$
$$Gamma - Gamma - gamma$$
$$Delta - Delta - delta$$
$$Epsilon - Epsilon - epsilon$$
$$Zeta - eta - zeta$$
$$Eta - Eta - eta$$
$$Theta - Theta - heta$$
$$Iota - Iota - iota$$
$$Kappa - Kappa - kappa$$
$$Lambda - Lambda - lambda$$
$$Mu - Mu - mu$$
$$Nu - Nu - u$$
$$Xi - Xi - xi$$
$$Omicron - Omicron - omicron$$
$$Pi - Pi - pi$$
$$Rho - Rho - ho$$
$$Sigma - Sigma - sigma$$
$$Tau - Tau - au$$
$$Upsilon - Upsilon - upsilon$$
$$Phi - Phi - phi$$
$$Chi - Chi - chi$$
$$Psi - Psi - psi$$
$$Omega - Omega - omega$$
**加粗**
~~删除~~
#一级标题
##二级标题
###三级标题
eqnarray
$egin{eqnarray}a&=&b+c\&=&b+d+e\&=&d+e+f+gend{eqnarray}$
eqnarray*
$egin{eqnarray*}a&=&b+c\&=&b+d+e\&=&d+e+f+gend{eqnarray*}$
$$egin{eqnarray*}a&=&b+c\&=&b+d+e\&=&d+e+f+gend{eqnarray*}$$
align
$egin{align}a&=b+c\&=b+d+e\&=d+e+f+gend{align}$
align*
$$egin{align*}a&=b+c\&=b+d+e\&=d+e+f+gend{align*}$$
cases
$$a=egin{cases}b+c\b+d+e\d+e+f+gend{cases}$$
符号
省略号：
$cdots$
$ldots$
$vdots$
$ddots$
运算符测试
$x=sum_{i=1}^{n}a_i$
$$x=sum_{i=1}^{n}a_i$$
$x=prod_{i=1}^{n}a_i$
$$x=prod_{i=1}^{n}a_i$$
$y=lim_{x ightarrow 0} x$
$$y=lim_{x ightarrow 0} x$$
ewcommand
$ d x$
$ ewcommand{ d}{{ m d}} $
$ d x$
$fpie$
$ ewcommand{pie}{{^prime}}$
$fpie$
$ ewcommand{stra}[2]{left { egin{matrix}{#1}\{#2}end{matrix} ight }} ewcommand{strb}[2]{left [ egin{matrix}{#1}\{#2}end{matrix} ight ] } ewcommand{ino}[2]{left ( egin{matrix}{#1}\{#2}end{matrix} ight ) } ewcommand{udl}{underline} ewcommand{ovl}{overline}$
$stra{n}{m} strb{n}{m} ino{n}{m}inom{n}{m}$
$x^{underline{k}} x^udl{k}$
$x^overline{k} x^ovl{k}$