On Nov 11, 2012, at 1:54 PM, Gary Tupper <gtupper@peda.com> wrote:

But we should always check that our common sense is indeed sensible. Consider the function:

Common sense is never "sensible", if by "sensible" you mean "reasonable", even when it is right. That is the nature of common sense, it isn't reasoned, it is a concrete sense.

Bob Hansen