here's the other
i found it here, at the science tattoo emporium. check out the other tattoos, there are a few really neat ones.
for those of you not familiar with math like this; it's called euler's identity, after swiss 18th century mathematician euler. in the linked article the following quote is found
In 1988, readers of the Mathematical Intelligencer voted [Euler's Identity] "the Most Beautiful Mathematical Formula Ever". In total, Euler was responsible for three of the top five formulae in that poll.
i chose to get it not because i'm a huge fan of mr mathematician here, but because, like the readers of that magazine, i think the formula itself encompasses what i love about mathematics, that something that looks and seems complicated essentially is very simple. it's a beautiful sentiment. here's mine
update: i found one more. here i was thinking i was original.