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IEVref:103-03-01ID:
Language:enStatus: Standard
Term: unit step function
Synonym1: Heaviside function
Synonym2:
Synonym3:
Symbol: ε
Definition: function, zero for all negative values of the independent variable and equal to one for all positive values

Note 1 to entry: See Figure 1 below for a graphical representation of ε(t). The value ε(0) may remain undefined or may be defined according to the context.

Note 2 to entry: ε(xx0) denotes a unit step at the value x0 of the independent variable x.

Note 3 to entry: Notation H(x) is also used. Notation ϑ(t) is used for the unit step function of time. Notation ϒ(x) has also been used.

Figure 1 – Représentation graphique de ε(t)

Figure 1 – Graphical representation of ε(t)


Publication date:2009-12
Source:
Replaces:
Internal notes:2017-02-20: Editorial revisions in accordance with the information provided in C00020 (IEV 103) - evaluation. JGO
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