# 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: $\sum_{i=1}^n i^2$

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

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

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

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: $e^{\i \pi} + 1 = 0$

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: $e^{\i \pi} + 1 = 0$

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 $e^{\i \pi}$ and \frac{5}{10}  will produce $\frac{5}{10}$. 