IEVref: 103-03-01 ID: Language: en Status: 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 valuesNote 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(x − x0) 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 CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: