Pursuit Evasion  any of a number of mathematical problems designed to track something within an environment More information 
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Quadratic Discriminant Analysis 
Quadratic Discriminant Analysis  where it is assumed that there are only two classes of points, and that the measurements are normally distributed More information 
Last Updated ( Monday, 30 October 2006 )

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Quantum Entanglement  in quantum mechanics: the idea that two objects can be described together even though they are separated in space. More information 
Last Updated ( Monday, 30 October 2006 )

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Quipu  a system of wool cords tied in knots developed by the Inca. The cords acted as an accounting system and form of writing More information 
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Radiocarbon Dating  a dating method that uses naturally occuring carbon14 to determine the age of an object. More information

Last Updated ( Monday, 30 October 2006 )

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Ralph Waldo Emerson  (18031882) American writer and leader of the Transcendental movement. More information 
Last Updated ( Sunday, 02 November 2008 )

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Random Match Probability  used in relation to DNA evidence, to calculate the frequency of a random sample match in a population More information 
Last Updated ( Monday, 30 October 2006 )

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Rationality Theorem  Conceived by Graham Allison, the theorem states:
There exists no pattern of activity for which an imaginative analyst
cannot write a large number of objective functions such that the
pattern of activity maximizes each function. (source)

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Recommender System  a series of general questions asked in order to link groups with similar tastes. More information 
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Refraction  The bending of light as it passes from one medium to another. More information 
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