测试title

[begin{equation}
E=mc^2
end{equation} ] [begin{equation}
aaa
end{equation}] ## This is an example link.

(sum_{i=0}^Nint_{a}^{b}g(t,i)text{d}t)

[begin{bmatrix}
{a_{11}}&{a_{12}}&{cdots}&{a_{1n}}\
{a_{21}}&{a_{22}}&{cdots}&{a_{2n}}\
{vdots}&{vdots}&{ddots}&{vdots}\
{a_{m1}}&{a_{m2}}&{cdots}&{a_{mn}}\
end{bmatrix}]

[begin{align*}
f(x) &= (x+a)(x+b) \
&= x^2 + (a+b)x + ab
end{align*}] # | Tables | Are | Cool | | ------------- |:-------------:| -----:| | col 3 is | right-aligned | $1600 | | col 2 is | centered | $12 |

(x^{(i)}), (parallelpartial f_{tiny极大值}) (emptyset)

(() big(big) Big(Big) bigg(bigg) Bigg(Bigg) big(Big) bigg(Bigg))

[
begin{array}{ccc}
x_{_{11}} & x_{_{12}} & dots & x_{_{1n}} \
x_{_{21}} & x_{_{22}} & dots & x_{_{2n}} \
vdots & vdots & ddots & vdots \
x_{_{m1}} & x_{_{m2}} & dots & x_{_{mn}} \
end{array}
]