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- and / with one argument should be identity functions.

PLease, let's *not* define (- X) and (/ X) to be something else
than X. It might be the source of obscure errors in (admittedly
ugly) code like:

(define (net-gain gain losses) (apply - gain losses))

Besides that, it may be cute, but it is neither clear nor
consistent, and therefore not "in the spirit of Scheme".

At least, that's my opinion.