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Gilbreath Principle
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Gilbreath Principle is the fact that when a sequence (which may or may not be a repeating sequence) is riffle shuffled into its reverse, there are certain properties of the mixed outcome that are mathematically guaranteed.
The observation was analyzed and documented by Norman Gilbreath and first described in The Linking Ring, Vol. 38, N° 5, July 1958, page 60 under Magnetic Colors.