> > (a-b)(a+b) = b(a - b)
>
> If a == b the (a-b) terms in the above line are a mathematical black
> hole.
>
> Wouter van Ooijen

No, they are perfectly well-defined and obey all the laws
of mathematics... until you get to the very last line:

2b = b    (everything's fine here)
therefore (NOT!)
2 = 1     (division by you-know-what error!)

Brian Aase

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