Markdown 数学公式

\left\lbrace 
\sum_{i=0}^{n}i^{2}=\frac{2a}{x^2+1}                            
\right\rbrace 

\[\left\lbrace \sum_{i=0}^{n}i^{2}=\frac{2a}{x^2+1} \right\rbrace \]

$$\vec{a}$$

\[\vec{a} \]

$$ x^2 x_i $$

\[x^2 x_i \]

$$\sqrt[x+1]{x^2}$$

\[\sqrt[x+1]{x^2} \]

f(x)=\begin{cases} 
		1, & x>0\\ 
		0, & x=0\\
		-1, & x<0
\end{cases}

\[f(x)=\begin{cases} 1, & x>0\\ 0, & x=0\\ -1, & x<0 \end{cases} \]

$$ \lceil \frac{x}{2} \rceil $$

\[\lceil \frac{x}{2} \rceil \]

$$ \lfloor x \rfloor $$

\[\lfloor x \rfloor \]

\int_{1}^{\infty}\\
\prod_{1}^{n} \\
\bigcup_{1}^{n} \\
\iint_{1}^{n}\\
\sum_1^n{n_i}

\[\int_{1}^{\infty}\\ \prod_{1}^{n} \\ \bigcup_{1}^{n} \\ \iint_{1}^{n}\\ \sum_1^n{n_i} \]

$$x_n\stackrel{p}\longrightarrow0$$

\[x_n\stackrel{p}\longrightarrow0 \]

$$\lim\limits_{x\rightarrow\infty}$$

\[\lim\limits_{x\rightarrow\infty} \]