Warp wrote:
>   Can it be that even some elementary school math teachers don't themselves
> fully understand the generic rules, and instead just blindly repeat the
> examples of the textbooks?

I'm firmly convinced that is indeed the case. In the US at least, you get a 
degree in "teaching", not in a specific subject. It's usually not until high 
school that you even meet someone with an advanced degree in the field 
they're teaching. (Of course, college and university is different.)

-- 
   Darren New, San Diego CA, USA (PST)
   "Ouch ouch ouch!"
   "What's wrong? Noodles too hot?"
   "No, I have Chopstick Tunnel Syndrome."

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