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Old 2004-08-14, 16:20   #2
davar55
 
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May 2004
New York City

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The function is infinite for x > 1,
is not well defined for x <= 0,
and is constantly 1 for 0 < x <= 1.

Hence the derivative is only defined for 0 < x < 1,
and equals zero there !!
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