Here are some commands to get you started. If you'd like to insert an equation within your text, surround your equation with single dollar signs ($
). If you'd like the equation to be on its own line, use double dollar signs ($$
).
Formula  How to type it  Comments 
$$\approx$$ $$\equiv$$ $$\neq$$ $$\le$$ $$\ge$$ 
\approx \equiv \neq \le \ge 

$$\mathbb{N}, \mathbb{Z}, \mathbb{Q}, \mathbb{R}, \mathbb{C}$$ $$\aleph$$ 
\mathbb{N} \aleph 
natural, integers, rational, real, complex aleph 
$$\gamma, \delta, \lambda$$ $$\Gamma, \Delta, \Lambda$$ 
\gamma \Gamma 
lowercase Greek Capital Greek 
$$x^2$$ $$2^{xy}$$ 
x^2 2^{xy} 
superscript 
$$C_8 H_{10} N_4 O_2$$  C_8 H_{10} N_4 O_2  subscript 
$$\frac{a}{b}$$  \frac{a}{b}  fraction 
$$\sqrt{n}$$ $$\sqrt[n]{ab}$$ 
\sqrt{n} \sqrt[n]{ab} 
radical (root) 
$$\sum_{j=0}^n$$ $$\prod_{i=0}^m$$ 
\sum_{j=0}^{n}
\prod_{i=0}^m 
sum
product 
$$\lim_{x \to \infty}$$  \lim_{x \to \infty}  limit 
$$\int x \, dx$$ $$\int_1^5 x \, dx$$ 
\int x \, dx
\int_1^5 x \, dx 
integral ( \, adds a space) 