
Quasiperiodicity is the property of a system that displays irregular periodicity. Periodic behavior is defined as recurring at regular intervals, such as `every 24 hours`. Quasiperiodic behavior is a pattern of recurrence with a component of unpredictability that does not lend itself to precise measurement. It is different from the mathematical .....
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http://en.wikipedia.org/wiki/Quasiperiodicity

(from the article `quasicrystal`) ...Steinhardt, physicists at the University of Pennsylvania, proposed a resolution of this apparent conflict. They suggested that the translational ...
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http://www.britannica.com/eb/a-z/q/5
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