On my website, to insert mathematics you have to use LATEX. For instance, let's say we wish to insert math within a sentence such as $F=ma$. This can be done by typing \$F=ma\$. Or, if you wish to display an equation by itself out of a sentence such as: $$ F=ma $$ Then, enclose the math expression within two dollar signs as follows:

$$ F=ma $$

Greek Symbols

Greek symbols are generally written the way they are pronounced. Thus, $\theta$, $\xi$, $\psi$ can be written as \$\theta\$, \$\xi\$, and \$\psi\$ respectively. Capital Greek letters are written by uppercasing the first letter. Thus, $\Psi$, $\Theta$, and $\Xi$ are typeset as \$\Psi\$, \$\Theta\$, and \$\Xi\$.

Fractions

A fraction such as $$ c=\frac{a}{b} $$ should be coded as

c=\frac{a}{b}

A fraction within a fraction: $$ c=\frac{a+\frac{3}{2}}{b} $$ is coded as:

c=\frac{a+\frac{3}{2}}{b}

Subscripts and Superscripts

Subscripts and superscripts such as $$ a=b^{c+\frac{1}{2}}_{d+2} $$ should be written as:

a=b^{c+\frac{1}{2}}_{d+2}

Text within Equation

The text that appears within an equation such as $$ \phi= \frac{\textrm{performance}}{\textrm{price}} $$ should be written as:

\phi= \frac{\textrm{performance}}{\textrm{price}}

Integrals

An integral such as $$ \epsilon=\int_{x=0}^L \left( \frac{x}{5}-\frac{x^2}{2} \right) dx $$ should be coded as:

The sum of a series $$ s=\sum_{i=1}^N (b-a)^i $$ should be coded as

s=\sum_{i=1}^N (b-a)^i

Numbered Equations

If you wish to write an equation with an equation number as follows: \begin{equation} F=ma \tag{23a} \label {eqn:newton} \end{equation} Type the following: