Simplify Algebraic Expression

[DavesChillaxin]

Here is my first ever attempt at creating anything solely math related.

So having said, there are known bugs. Simply put, it cannot handle large numbers. But soon I hope to find the time where I can implement a solution to solve this issue.


Updates:
November 10th - Initial support* for the basics. IE (), *, /, +, -, and ^.
November 11th - Square Roots (√) is now supported). Format: √(x)
November 12th - Summation (∑) is now supported*. Format: ∑(expression,index,lower,upper)
November 13th - Complete reconstruction of my operations that fixed a few bugs.
November 17th -Factorials (!) is now supported* and all doubles have now been replaced with decimals. Plus some more bugs fixed.
February 10th 2013 - Negative (-) signs were not being recognized as numeric values.

*AT THE MOMENT I REALIZE AN ON GOING ISSUE. When converting to string from a double, if the number is large/small enough I'll receive my converted string in scientific notation. Which cannot be converted back into a double. I'm working hard at the moment to fix this, but if anyone has any suggestions please do tell. In the mean time, avoid using any fractions which can produce irrational numbers. Those seem to be the killers. However once supported, the Pi and e Symbols will be added to the support list.

*DO NOT USE SQUARE BRACKETS ([, ])IN YOUR EQUATIONS. When an equation such as, (-1)^n is simplified. It becomes [-1]^n for evaluation purposes. My guess would be that if you used any, then that would cause an exception.