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Heaviside unit function

noun Mathematics.
  1. the function that is zero for any number less than zero and that is 1 for any number greater than or equal to zero.
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Origin of Heaviside unit function

First recorded in 1935–40; named after O. Heaviside
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018