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About UnitStep and ZeroValue
In Mathematica 3.0, UnitStep is defined in package Calculus`DiracDelta` and there is an option named ZeroValue, which enables the user to define the value of UnitStep. http://documents.wolfram.com/v3/AddOns/Calc_DiracDelta-.html or http://tinyurl.com/35rtl7 In Mathematica 5.0, UnitStep is a built-in function and the default value of UnitStep is 1. It seems that ZeroValue is no longer accessible. Is there any method of changing this default value? Thank you in advance.