OBSERVATION (unaddressed conditions)

An unaddressed condition becomes, in time, either forbidden or presumed.
The take-away of the Ives riddle is the fragility of memory. In Calculus, the unaddressed condition in the theorem about the integral of a power becomes, in the student’s mind, forbidden,
and the necessary condition in the derivation of the integral representation of the logarithm is presumed, by the student, after the long derivation, to be sufficient.