I didn't know there was a Pi day... Well, I guess I know now.

wow, me either, anybody know a good site to find the values digits of pi?
i think we should have a moment of silence for pi...............k that's enough. now break out the beer and celebrate!

whoa.. PI day has been around for a while. i have always enjoyed this day, and is my fav holiday.. why is this not a national holiday?i mean who doesnt want to feel the joy and pleaasure of the worlds most irrational number??? lol j/k

One number is not more irrational than another. Irrational numbers are simply numbers with no repeating pattern. Pi does not have any more randomness than e, or the square root of 2.

Uh... "lol j/k" usually means whoever said is just kidding.

Pi and e are transcendent. The square root of 2 is irrational, but algebraic, meaning it is a root of a rational polynom (x²-2=0 for example). Transcendent numbers like pi or e cannot be roots of any polynom with rational coefficients.

Thus, pi is actually more irrational than the square root of 2.

You are correct, but pi still isn't any more irrational than e.

No, but it's got a higher value :)

I like this particular equation:

e^(pi*i)+1=0

Try it, it works

This formula united three symbols from three different math branches

PI is geometry symbol
e is mathematical analysis symbol
i is algebra symbol

+++++++++++++++++++++++++++++++++++

By the way, we in Europe has different method of date writing (day, month, year) so for us it is not PI day,
i.e 14.3

And two numbers used extensively in all three of those:
0 and 1

Well, you guys need to your act together and make a 14th month.

No, they need another day in April.

"we in europe"?
In sweden we have always written YYMMDD so here it was pi-day also. And last time I checked, sweden was a part of europe :)
I always use the ISO-standard, YYYY-MM-DD though.

Does anyone know WHY that works?

I know I saw a link to it somewhere, but never looked at it. I wish I had now.

It is a consequence of Cauchy's theory of complex functions.

Take a look at my writeup on the equation over at everything2... linked above.

Let y=cis(x)=cos(x)+i*sin(x)
y*i=i*cos(x)+i²sin(x)=-sin(x)+i*cos(x)
dy/dx=-sin(x)+i*cos(x)
Therefore, dy/dx=iy

dy/dx=iy
dy/y=idx
ln(y)=ix+c
y=Ae^(ix)

Since y=1 when x=0, A=1

Therefore, e^(ix)=cos(x)+i*sin(x)

/me cries.

I thought I was finished with my days of polar form. It isn't easy having a sadistic teacher, you know.

I remeber PI day last year, there was a site that had a 10MB file containing digits of PI, but the ISP took it offline because it was causing them bandwidth problems. There is a site, however, that does have source code for a C program than can calculate PI. It took my compuer(128MB of RAM and a AMD 450mhz) a few minutes to calculate 9999 digits. the URL for that site is http://www.dc.ee/Files/Programm.C/

If you go to joyofpi.com, I think they still have a link to a place where you could download hunreds of megs of pi (and 1/pi)...

i had a friend at camp that knew like 100 digits of pi

Someone I know has memorized the first 300 or so.

What a geek.

In a newspaper story, I heard of a kid that memorized 5000 digits of pi for his school's pi memorization contest.

I know like 150 or so... kept me occupied during Geometry. Some people know like 40,000. And I thought I had too much time on my hands ;).

Yeah that was my site. The guy still won't let me put it back on!

Happy PI day everyone.... if you want the 10MB PI file, email me, and I'll post it on my site.

I didn't know there was a PI day until today. My calculus class could have had an interesting discussion (as opposed to the regular, sleep-inducing ones).

Just recently, I learned that the exact value of PI= the definate integral of sqrt(1-x^2) from -1 to 1, which my TI-92+ will calculate out till about 500 digits (that's when I hit the ON key because it's taking so long)

Well, happy PI day everybody!

not only is it PI day, It's Albert Einstein's birthday