# 3.3. Brackets, Tables and Arrays¶

## 3.3.1. Brackets¶

Code Meaning
$(x+1)$

Brackets
$3[2+(x+1)]$

Square brackets and normal brackets
$\{a,b,c\}$

Curly brackets - curly bracket is reserved in Latex
$\% 50$

Dollar sign - dollar sign is reserved in Latex
$3\left(\frac{2}{5}\right)$

Expanded brackets
$3\left[\frac{2}{5}\right]$

Expanded square brackets
$3\left\{\frac{2}{5}\right\}$

Expanded curly brackets
$\left|\frac{2}{5}\right|$

Absolute value
$\left.\frac{2}{5}\right|$

No left bracket
$\left.\frac{dy}{dx}\right|_{x=1}$

Value of a derivative at x=1

## 3.3.2. Tables¶

Code Meaning
\begin{tabular}{|c|c|c|c|c|c|}
\hline
$x$ & 1 & 2 & 3 & 4 & 5 \\ \hline
$f(x)$ & 10 & 11 & 12 & 13 & 14 \\ \hline
\end{tabular}


Table with border and grid:

• c = column
• & = next column
• | = vertical line
• \\ = new line
• \hline = horizontal line

## 3.3.3. Equation Arrays¶

Code Meaning
\begin{eqnarray*}
5x^2 - 9 &=& x + 3 \\
4x^2 &=& 12 \\
x^2 &=& 3 \\
x &\approx& \pm 1.732
\end{eqnarray*}


Equation array:

• * = no equation numbers
• \\ = new line
• &=& = line up by equals sign
• &\approx& = line up by approx. equals sign
• \pm = plus or minus