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characteristic function

noun, Mathematics
a function defined on a given set, having value 1 for every element of the set and value 0 for every element not contained in the set.
Origin of characteristic function
1875-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for characteristic function

characteristic function

(maths) a function that assigns the value 1 to the members of a given set and the value 0 to its nonmembers
(statistics) a function derived from the probability distribution function that enables the distribution of the sum of given random variables to be analysed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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characteristic function in Technology

The characteristic function of set returns True if its argument is an element of the set and False otherwise.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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