50g System RPL list processing

[Han]

(10-31-2014 08:53 PM)Marcus von Cube Wrote:  The behavior of nil and one should be that of 0 and 1 for numbers:

nil + some object = some object
nil * some object = nil
one * some object = some object

This works only if + and * are defined for some object. If some object is a number, one is 1 and can also be used in addition.

I don't understand the point of "one" -- "nil" actually makes sense with respect to empty sets. At what point will you ever use a regular operation and expect an ambiguous "one" ? The notion of "one" is a solution to a problem that does not seem to exist.