Bastian,
Please start new threads, rather than hitting "Reply" in your mail
client and just changing the subject line. The message ids and
history information are still in the reply which messes up threading
for folks who read online, or for surfers after the fact. Reference
this very thread as
Mathematically speaking, another way to think about it is this:
sqrt(x**2) != x (same reasoning, try x < 0)
A little more generically:
sqrt(x**2) == norm(x) ("2 norm of x")
You may (not) be interested in this wikipedia article:
http://en.wikipedia.org/wiki/Norm_(mathematics)
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