Daniel Lemire wrote:
>
> I specifically said that I was assuming all my variables and constants
> to be real. I said it several times, even repeating it quite clearly in
> the message you are answering to.
Yes, I know you said it several times. Do you also teach your students
that the quadratic equation x^2+1=0 has no roots, since all your variables
and constants are real? If so, that seems to be unfortunate.
I am reminded of an old joke,
"How many legs does a sheep have if you call its tail a leg?"
Answer:
Four. Calling its tail a leg does not make it a leg.
Cheers.