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Metalepsis Loyal user 232 Posts 
I have recently become very interested in this principle, it is strange how people have more trouble understanding this than convergence. Remarkable. Anyway, one of my new favs is 'The angel may shuffle but the devil still deals'. Anybody else have favourite GP tricks?
M 

Scott Cram Inner circle 2662 Posts 
In no particular order:
"Aunt Mary's Terrible Secret" by David Williamson (available in a book of the same name) "Best Bet Yet" by Terry LaGerould (From "A Magical Baker's Dozen", available via Lew Brooks) "Please Don't Match" by Terry LaGerould (unpublished)  In this effect, the spectator shuffles the deck, takes out 7 cards, and shuffles them. These cards are torn in half, and then these 14 halves are shuffled together. This halfcard stack is placed into the performer's pocket (examined previously), and he pulls cards from the pocket one by one, betting that he'll never pull out the remaining half of any card that was previously pulled. The performer always wins the bet. 

rgranville Elite user Boston area 462 Posts 
While I know several effects based on the Gilbreath Principle, and I know it is "a thing of terrifying beauty," I don't precisely know the exact principle itself. Where can I find a write up defining and detailing the Gilbreath Principle?
:carrot: 

Metalepsis Loyal user 232 Posts 
College Math Journal: Volume 31, Number 3, Pages: 173177 2000 Modeling Mathematics
With Playing Cards Martin Gardner If you want some homework! faculty1.coloradocollege.edu I will look for better explanations...although using coloured balls in tubes is a good way to explain it visually (ask me for details if you like). Are you looking for academic formal analysis or a (mathematically speaking) laymans explanation? Our own Jim Morton has offered to email anyone a PDF on the subject in a previous thread: http://www.themagiccafe.com/forums/viewt......2&38 Which also has some great tricks listed already for this topic, still even though I found that I wanted to start a new thread and hear what people think (maybe someone has changed their mind...or there are new people unaware of the beauty). M 

Hushai Elite user St. Louis, Missouri, USA 403 Posts 
I am hoping that Phil Goldstein will in fact publish his longawaited book on Gilbreath before I am too old to shuffle a deck of cards. If it is anything like as clear an explanation of Gilbreath as "Redivider" was of Rusduck, all of us like rgranville and me who are still not sure we understand Gilbreath will rejoice. "Redivider" was wonderful  the right mix of theory and effects for a nonmathematical layperson like me.


rgranville Elite user Boston area 462 Posts 
But I do have a mathematical background. I have asked Jim Morton for his writeup. I'm still looking for a precise definition of the principle.
:cucumber: 

EmmanuelM New user 24 Posts 
Quote:
I'm still looking for a precise definition of the principle. Well, the scientific literature about this principle quote the Linking Ring article by Gilbreath ! I found some references about the Gilbreath principle not for any real use, but as a test for inductive theorem prover programs : Gilbreath's principle is at the same time easy to formalize, and nontrivial when you want to convince someone that your prover has "found something" that was "neither written in the rules nor in the prover", I guess. You can find such a reference in : www.cs.utexas.edu which starts with : Quote:
A Mechanical Checking of a Theorem About a Card Trick 

Metalepsis Loyal user 232 Posts 
Quote:
I found some references about the Gilbreath principle not for any real use, but as a test for inductive theorem prover programs : Gilbreath's principle is at the same time easy to formalize, and nontrivial when you want to convince someone that your prover has "found something" that was "neither written in the rules nor in the prover", I guess. I think I'm in love. That's my language. Is this your field or do you just visit? M 

Aron Devin New user Chattanooga, TN 78 Posts 
One of the best effects I've ever seen was Max Maven's "Mockingbird" effect on his "VideoMind" series. Unbeliveable. It's pert of the L and L series. I remember first seeing it and thinking there had to be a stooge helping him out.


Caliban Special user 725 Posts 
There are some good tricks using the principle in the excellent Card Conspiracy Volume 1 by Duffie and Robertson.


mindhunter Inner circle Upstate NY 1939 Posts 
"DoubleDown", but of course I am biased.
The principle really IS a "thing of terrifying beauty..." Bryn
"The Safwan Papers" eBook: $30
Please read the many great reviews here at the Cafe: http://www.themagiccafe.com/forums/viewtopic.php?topic=253272&forum=15 "THE LOGAR SCROLLS" eBook is also now available ($30) http://www.themagiccafe.com/forums/viewtopic.php?topic=464100&forum=303&70 SPECIAL: "LOGAR" & "SAFWAN PAPERS" Combo Deal: $50 Also available at: www.mentalismcenter.com Thanks, Bryn cavscout19@hotmail.com (also my PayPal for purchases) 

LobowolfXXX Inner circle La Famiglia 1168 Posts 
Nick Trost's "The Lone Stranger."
"Torture doesn't work" lol
Guess they forgot to tell Bill Buckley. "...as we reason and love, we are able to hope. And hope enables us to resist those things that would enslave us." 

JSBLOOM Inner circle 1954 Posts 
Mocking bird by Max Maven.


Scott Cram Inner circle 2662 Posts 
For those who like Mockingbird, check out Sal Piacente's "Memory Opener", which uses a similar approach.


landmark Inner circle within a triangle 4533 Posts 
Nick Trost's Odd Man Wins
Simon Aronson's Point Spread Jack Shalom
"Don't believe everything you read on the Internet"Abraham Lincoln
You can read my daily blog at Musings, Memories, and Magic 

Vandy Grift Inner circle Milwaukee 3505 Posts 
Quote:
On 20050313 11:47, Scott Cram wrote: I use Sals' memory opener a lot, its a great trick. I also believe Sals' "Paint Poker" uses the principle as well, but I am not certain about that one. Vandy
"Get a life dude." some guy in a magic forum


graemesd Veteran user 370 Posts 
Clash of symbols in Thavant  phil goldstein/maven


LordPH Regular user Suomi 189 Posts 
Aunt Mary's Terrible Secret by David Williamson
Mockingbird by Max Maven.
Lucas Ace
Ultimatemagic.Net Helsinki Street Team 

TomasB Inner circle Sweden 1133 Posts 
LordPH, what do you do the times Mockingbird doesn't work? There seem to be a fairly big chance of it failing...
Ooops, I was thinking about The Hawk and now this post can only be edited but not erased. Please ignore. /Tomas 

Magiguy Inner circle Seattle, WA 5254 Posts 
Aunt Mary's Terrible Secret by David Williamson... I really like this one and the book is so entertaining that it's difficult to put down. You'll also find many, many effects and interesting references in the volumes of "The James File."


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