Oliver Heaviside
The life of Oliver Heaviside - The Hermit who Rewrote Maxwell's Laws
Heaviside Step Function
A discontinuous function whose value is zero for negative arguments and one for positive arguments.
\[ H(x) = \begin{cases} 0 & x < 0 \\ 1 & x \ge 0 \end{cases} \]
Sources: https://mathshistory.st-andrews.ac.uk/Biographies/Heaviside/

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