Useful LaTeX resources

Horizontal and vertical curly Latex braces: \left{,\right},\underbrace{} and \overbrace{} | Math-Linux.com

Under or Over commands

underset

$$
\dfrac{M}{p} = l(r) + \underset{+}{k(y)}
$$

Output:

$$\frac{M}{p}=l(r)+\underset{+}{k(y)}$$

underbrace

$$
Y = AD = \underbrace{C + I}_{\textrm{Private Exp.}} + \underbrace{G}_{\textrm{Public Exp.}}
$$

Output:

$$Y=AD=\underset{\text{Private Exp.}}{\underbrace{C+I}}+\underset{\text{Public Exp.}}{\underbrace{G}}$$