## π Day

March 14 is the $\pi$ day. Coincidentally, March 14 is also the birthday of Albert Einstein.

The best encyclopedic resource for anything related to mathematics is Wolfram MathWorld which is created, developed and nurtured by Eric Weisstein. I have tremendous respect for  encyclopedists. They are doing a great service to humanity.

Check out the following pages for information on $\pi$.

http://mathworld.wolfram.com/Pi.html

http://www.wolframalpha.com/input/?i=pi&x=5&y=4

I mentioned the Euler rule few times. The number $\pi$ is connected to the other fundamental numbers of mathematics through the Euler rule:

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