Quote:
Originally Posted by running-gag  Hi,
By deriving f on each interval ![[2^j,2^{j+1}]](http://www.mathhelpforum.com/math-help/latex2/img/1bee970f34a54f213b05271794d83b6b-1.gif "[2^j,2^{j+1}]") we find 
Therefore f is decreasing up to  (up to j=7) is constant between and  (for j=8) and increasing from (from j=9)
The minimum of f is reached between and | It can be done more neatly without calculus.
CB
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