| Definition: | function, zero for all negative values of the independent variable time and equal to one for all its positive values, described by X , where δ(t) is the unit impulse SEE: Figure 4b), IEC 60050-103:2009, 103-03-01, and IEC 60027-6. Note 1 to entry: The value ε(0) of the unit-step function ε(t) may remain undefined or may be defined according to the context.
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