As I promised, today we'll learn on how to create new entries with math expressions using just a few new symbols ;) When we need to work on a scientific paper, we use LaTeX Scientific Editor, which is worldwide famous.

**-Exercise 0: Math's Enviroment and basic symbols: **if you want to include a math formula on a entry or comment, you must first create a "math enviroment". It's very simple, you have to enclose your formulas using the dollar symbol: "$"

Basyc Symbols: TeX recognizes the +, -, =, <, > and : symbols. If you want the multiplication point to be shown, you should write \cdot ("center dot").

$3+5-2 \cdot 3 = 8 - 6 = 2$

**-Exercise 1: How do I write a fraction with LaTeX?** To write a fraction, for example "one over eight", you should write "\frac{1}{8}" within a math enviroment (between dollars). The \frac part stands for "fraction".

Try now to post this entry writing the following operation (you must yourself get the result):

**-Exercise 2: How do I write a power with LaTeX?** To write a power, for example "4 raised up to 8", you should write "4^{8}" between dollars. The ^ symbols stands for "raised up to".

Post a comment showing the solution of the following operation:

**-Exercise 3: Try to write the next expression combining the two examples above:**
**-Exercise 4: How do I write brackets with LaTeX?** Remember, every time you open a bracket (the "left" bracket) you must close it sooner or later (using the "right" bracket). LaTeX also works on well with the brackets symbols, so if we want to write, for example,

we should type (-3)^{-2} between dollars.

Type the needed code to represent the following expression:

**-Exercise 5: Final Test: **Write a comment showing the formula:

**-Final Assigment: **Would you like to be able to show your formulas in a bigger size? LaTeX provides you a quickly solution; for example:

$\frac{1}{2}$ $$\frac{1}{2}$$ $\huge{\frac{1}{2}}$ $\Huge{\frac{1}{2}}$