MathGroup Archive 2007

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About UnitStep and ZeroValue

In Mathematica 3.0, UnitStep is defined in package
and there is an option named ZeroValue, which enables the user to
the value of UnitStep[0].

In Mathematica 5.0, UnitStep is a built-in function and the default
value of UnitStep[0] is 1. It seems that ZeroValue is no longer
accessible. Is there any method of changing this default value?

Thank you in advance.

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