KaTeX

Dots

x_1 + \dots + x_n

{n(n + 1)} \over 2

\displaystyle\sum_0^n

\textstyle\sum_0^n

\cfrac{2}{1+\cfrac{2}{1+\cfrac{2}{1}}}

\begin{matrix} a & b \\ c & d \end{matrix}

\begin{bmatrix} a & b \\ c & d \end{bmatrix}

\begin{cases} a &\text{if } b \\ c &\text{if } d \end{cases}

\begin{aligned} 1.10101010100001101000010 &= 1 + (1 \times 2^{-1}) + (0 \times 2^{-2}) + (1 \times 2^{-3}) + (0 \times 2^{-4}) + \dots \\ &=1 + 2^{-1} + 2^{-3} + 2^{-5} + 2^{-7} + 2^{-9} + 2^{-14} + 2^{-15} + 2^{-17} + 2^{-22} \\ &=1.0 + 0.666115 \end{aligned}