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Can someone provide a reference for this fact on the internet?

While I know this fact is proved in many text books, but I cannot find a proof of this fact very easily on the internet

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  • $\begingroup$ If you're lucky your post may become your reference (sorry :) ) $\endgroup$ – Mehness Dec 1 '16 at 11:39
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http://www.math.tau.ac.il/~uriy/Papers/encyc57.pdf - page 5 in this does that do it?

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