Trinity Moodle

$$\sum_{n+2}^x$$  is  $\sum_{n+2}^x$

$$\sigma$$ gives $\sigma$

$$\Sigma$$ gives $\Sigma$

$$~\unitlength{.6}~\picture(100){~~(50,50){\circle(99)}~ ~(20,55;50,0;2){+1$\hat\bullet}~~(50,40){\bullet}~~(50,35){\circle(50,25;34)}~ ~(50,35){\circle(50,45;34)}}$$  is $~\unitlength{.6}~\picture(100){~~(50,50){\circle(99)}~ ~(20,55;50,0;2){+1$\hat\bullet}~~(50,40){\bullet}~~(50,35){\circle(50,25;34)}~ ~(50,35){\circle(50,45;34)}}$

• Synatx: \left[...\right]
• Ex.: $$\left[a,b\right]$$ gives $\left[a,b\right]$

@@@sqrt{x}@@@  is @@sqrt(x)@@

underscore $$x_2$$  is   $x_2$

• General syntax for symbols with a kind of lower and upper limits:

\symbolname_{lowerexpression}^{upperexpression}

• In general, there are two ways how these lower and upper expressions can be placed: centered below and above the symbol or in a subscript / superscript manner. In the first case the symbol name is preceded by the word "big", in the second there is no prefix.
• Syntax for summation symbol:

$$\bigsum_{i=k}^{n}$$   gives  

$\bigsum_{i=k}^{n}$

and

$$\sum_{i=k}^{n}$$   gives 

$\sum_{i=k}^{n}$

• Use font size commands for a nicer picture:

$$\LARGE\bigsum_{\small{i=1}}^{\small{n}}$$   gives  

$\LARGE\bigsum_{\small{i=1}}^{\small{n}}$

and

$$\large\sum_{\small{i=1}}^{\small{n}}$$   gives 

$\large\sum_{\small{i=1}}^{\small{n}}$

$$x^2$$ or $$x^3$$ is $x^2$ or $x^3$