# Submit a lesson

EngineerSphere.com is created by students and created for the students. If you have a specific engineering related topic that you are particularly good at, please show us!

To make a post, log in and visit your admin panel and choose ‘post’. Give it a title and a heart-warming subject lesson and then hit submit. Your post will likely be approved and posted within a days time.

Think of it as a way to give back to the community, or a chance to help someone who is frustrated and could really use a good push in the right direction.

**Directions for inserting equations into your posts:**

**All symbols and such are here and here. I think a lot of these work as well.
**

Make sure you start the equation with a $ sign followed by “latex”. Then end your equation with a $ sign. So it looks like this when you are filling out your post…(Dollarsignlatex equation here Dollarsign).

$\textstyle \sum_{i=1}^n i^2$ Will Give you:

For example writing $\lim_{x\to c}\frac{f(x)-f(c)}{x-c}$ will give you an inline math formula

$\begin{pmatrix}a&b&c&d&e\\f&g&h&i&j\\k&l&m&n&0\\p&q&r&s&t\\u&v&w&x&y\end{pmatrix}$

To produce:

I’ve used the [WordPress Shortcode Syntax](http://codex.wordpress.org/Shortcode_API).

You may alternatively use the following equivalent syntax reminiscent of LaTeX’s inline

math mode syntax.

**Can I change the color of the images produced**?

Yes. You can set the default text color and background color of the images in the

Plugins -> WP LaTeX admin page.

You can also change the colors on an image by image basis by specifying `color`

and `background` attributes inside the LaTeX shortcode. For example:

[.latex color=”ff0000″ background=”00ff00″]e^{\i \pi} + 1 = 0[./latex] (remove periods)

will produce an image with a bright green background and a bright red foreground color.

Colors are specified in RGB with the standard 6 digit hex notation.

like this:

**Can I change the size of the image?**

You can specify a `size` attribute in the LaTeX shortcode:

[.latex size=”4″]e^{\i \pi} + 1 = 0[./latex] (remove periods)

Will make:

or, equivalently, an `s` parameter after the LaTeX inline syntax:

$.latex e^{\i \pi} + 1 = 0&s=4.$ (remove periods) Will give you the same thing.

The size can be any integer from -4 to 4 (0 is the default). These numbers correspond to

the following LaTeX size commands.

`

size = LaTeX size

-4 \tiny

-3 \scriptsize

-2 \footnotesize

-1 \small

0 \normalsize (12pt)

1 \large

2 \Large

3 \LARGE

4 \huge

**Posting Tips:**

Whenever you want to make make use of division or powers, or any equation that requires grouping terms together remember to wrap the group in { group } and put a slash (\) before each item. For example, e^{\i \pi} will produce and \frac{5}{10} will produce .

**What about schematics**?

Add schematics to your post by inserting an image of the schematic.

Happy posting 🙂