Woot! Pie Day again!

BoomerD

No Lifer
Feb 26, 2006
63,142
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Not many restaurants around here celebrate it...but I'll be looking. I like pie.
 

SteveGrabowski

Diamond Member
Oct 20, 2014
7,030
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One of my friend dated a guy from Caltech and she told me one of the traditions there was to run through the halls naked screaming It's Pi Day on March 14th at 3:14AM
 

SteveGrabowski

Diamond Member
Oct 20, 2014
7,030
5,930
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BTW one of my favorite proofs I have ever read showing pi to be irrational using only highschool calculus:

 

BoomerD

No Lifer
Feb 26, 2006
63,142
11,531
136
By preferred order:

1. Lemon Meringue
2. Blueberry
3. Cherry
4. Apple
5. Strawberry Rhubarb(?)
6. Pumpkin

I don't even know what rhubarb is. Pumpkin I can only do over Thanksgiving, and apple HAS to have vanilla ice cream.
1 Apple...don't care about the ice cream (but wouldn't pass if it came with it)
2. Blueberry
3. Lemon Meringue
4. Key Lime
5. Coconut Cream
6. Banana Cream

Rhubarb...no thanks...even strawberry rhubarb gets a hard pass from me.
Pumpkin...yeah, one or two slices at Thanksgiving...but that's it.
 
Reactions: thestrangebrew1

thestrangebrew1

Diamond Member
Dec 7, 2011
3,466
403
126
I'm so over apple pie. Oy.
Why? Is it something you eat regularly? I can't remember when the last time was I had apple pie. We bought a frozen one from our nephew as some kind of fundraiser he was doing a few years ago and that thing is still sitting in our freezer lol. Oh, pretty sure it doesn't count, but I got a couple of apple pies from McD's a few months ago.
 

SteveGrabowski

Diamond Member
Oct 20, 2014
7,030
5,930
136
You must have gone to a different high school.
The details of showing f^{(j)}(0) and f^{(j)}(pi) are integers are a little tedious and depend on a binomial theorem like expansion for finding the nth derivative of a product of two functions but it's pretty straightforward. The most advanced result used in the proof is that c^n/n! goes to zero as n gets arbitrarily large for any constant c, but pretty sure that gets taught in calculus too, and not saved for real analysis.
 
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SteveGrabowski

Diamond Member
Oct 20, 2014
7,030
5,930
136
To go along with the proof pi is irrational using only HS calc figured I'd post this video I got in my feed today showing how to make really good rational approximations to pi using only HS calc.


This family of integrals shows why 22/7 is a good approximation for pi, why 431302721/137287920 is within 0.000000001 of pi, why 89293478252053341114758995682016773/28422996899365886608045972478361600 is within 0.000000000000000000000000000001 of pi, etc. Pretty cool way to quickly generate extremely accurate rational approximations of pi from doing a straightforward integral with the hardest part of the computation being doing polynomial long division.
 
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