Similarly, I guess that  rootOf  is a  library function (implemented in
Spad), and is not a language operation (like +, * ...) for forming an
arithmetical expression (is it?).

Library function.

Bill also wanted to say that + and * are library defined functions except for a few basic domains like Integer. But for example, addition/multiplication with rational numbers is defined in the Fraction domain constructor. And there +,-,*,/ are defined in the library.

Ralf

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