MathGroup Archive 1999

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Attribute : Listable


I have a problem with the attribute "Listable".

It is said in documentation that a function is threaded over lists if
one of its attributes is "Listable". 

Neither the function N nor the function ComplexExpand has "Listable"
among its attributes and however both of them are mapped on lists of

Can someone explain me ?

Thanks in advance,


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