Comment Real Numbers (Score 1) 138
I always interpreted that quote as a comment on the existence of the real numbers.
Unless the head has some property that consumes any other value paired with it such that it always produces the value of the head.
If by + you are referring to a group operation then it could not have such a property.
"Mr. Spock succumbs to a powerful mating urge and nearly kills Captain Kirk." -- TV Guide, describing the Star Trek episode _Amok_Time_