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Home :: Archives :: News :: Happy Pi Day!
 Happy Pi Day! Posted by Eric on 14 March 2001, 06:08 GMT Today's always a festive day around these parts...after all, it's Pi Day (3/14), perhaps our favorite holiday around here (rivaled only, of course, by e Day and Mole Day). So anyway, before I head off for a heavy dose of pi celebrations, I'll point you all to last year's article, which contains lots of wholesome information about everyone's favorite number, courtesy of our own Andrew Selle. So...yeah, Happy Pi Day! Update (Eric): And while we're on the subject, let's take a moment to salute those die-hard Pi celebratorsjust take a look at this loyal reader and Pi Day devotee. Goes to show you that all your pi are indeed belong to us.Note: ticalc.org will not be held responsible for any mishaps that may arise due to unsuccessful stunts performed in the name of Pi Day.

 The comments below are written by ticalc.org visitors. Their views are not necessarily those of ticalc.org, and ticalc.org takes no responsibility for their content.

Re: Happy Pi Day!
Jon Hughes
(Web Page)

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

14 March 2001, 06:35 GMT

Re: Re: Happy Pi Day!
RongZeng

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!

14 March 2001, 07:04 GMT

Re: Re: Re: Happy Pi Day!
prabal
(Web Page)

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

14 March 2001, 07:39 GMT

Re: Re: Re: Re: Happy Pi Day!
Michael Vincent
(Web Page)

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.

14 March 2001, 15:59 GMT

Re: Re: Re: Re: Re: Happy Pi Day!
JaggedFlame

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

14 March 2001, 19:17 GMT

Re: Re: Re: Re: Re: Happy Pi Day!
Kevin Kofler
(Web Page)

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.

14 March 2001, 20:09 GMT

Re: Re: Re: Re: Re: Re: Happy Pi Day!
Michael Vincent
(Web Page)

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

14 March 2001, 23:17 GMT

Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
Joel Ericson
(Web Page)

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

15 March 2001, 00:38 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
Robert Mohr

I like this particular equation:

e^(pi*i)+1=0

Try it, it works

15 March 2001, 13:23 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
Samir Ribic
(Web Page)

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

15 March 2001, 20:39 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
Robert Mohr

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

15 March 2001, 21:36 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
eean

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

15 March 2001, 23:47 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
BB

No, they need another day in April.

16 March 2001, 00:51 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
Olle Hedman
(Web Page)

"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.

16 March 2001, 12:20 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
Tim Dorr
(Web Page)

Does anyone know WHY that works?

15 March 2001, 21:06 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
Robert Mohr
(Web Page)

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

15 March 2001, 21:47 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
Samir Ribic
(Web Page)

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

16 March 2001, 11:51 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
Chris Willmore
(Web Page)

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

17 March 2001, 04:03 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
Jason Schoenfelder

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)

19 March 2001, 14:56 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
Garrett Larson
(Web Page)

/me cries.

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

22 March 2001, 05:44 GMT

Re: Re: Re: Happy Pi Day!
Jonathan Harm
(Web Page)

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/

14 March 2001, 22:19 GMT

Re: Re: Re: Re: Happy Pi Day!
Joel Ericson

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)...

15 March 2001, 00:44 GMT

Re: Re: Re: Re: Re: Happy Pi Day!
Vercingetorix

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

15 March 2001, 01:26 GMT

Re: Re: Re: Re: Re: Re: Happy Pi Day!
eean

Someone I know has memorized the first 300 or so.

What a geek.

15 March 2001, 23:49 GMT

Re: Re: Re: Re: Re: Re: Re: Happy Pi Day!
joelt

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

16 March 2001, 03:47 GMT

Re: Re: Re: Re: Re: Re: Happy Pi Day!
Garrett Larson
(Web Page)

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 ;).

22 March 2001, 05:46 GMT

Re: Re: Re: Re: Happy Pi Day!
brentes
(Web Page)

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.

17 March 2001, 07:23 GMT

Re: Re: Happy Pi Day!
Noah Medling
(Web Page)

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!

15 March 2001, 03:24 GMT

Re: Re: Re: Happy Pi Day!
Don Quixote

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

15 March 2001, 12:31 GMT

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