Gardner's Mathemagic
Donald E. Simanek | Make Vol. 13- 2008 | Pdf | 4 pgs | 1 mb
The Gilbreath Principle
A number of card tricks are based on a principle that
magician Norman Gilbreath introduced to magic. It's
an application of combinatorial mathematics (which
we will spare you here). Gardner discusses it in
his books New Mathematical Diversions from
Scientific American, Chapter 9, and Mathematical
Magic Show, Chapter 7. We'll describe here the
simpler versions.
Prepare the deck ahead of time with the cards in
black/red alternation. No other order is necessary.
When you start this trick, you can do any false shuffle
that doesn't change the card order. But if you don't
have those skills, don't bother.
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