The rules are pretty simple:
Use each digit once, and only once.
The following mathematical functions are accepted:
subtraction
multiplication
division
grouping symbols
decimals
raised to a power
square roots
factorial (x! ex: 5! = 5*4*3*2*1 )
double factorial (x!! ex: 9!! = 9*7*5*3*1 6!! = 6*4*2
Obviously the winner is the one who can make the most numbers from the 4 digits. We decide the winner amongst us at the end of the month.
If you would like to post any solutions, I ask that you please do so in a spoiler.
Have fun and good luck.