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  • $\begingroup$ This proof I follow; +1. $\endgroup$ Commented Jan 8, 2018 at 15:04
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    $\begingroup$ Thanks Taras for this nice presentation! I accepted Uri's answer because it was the original one and I understood it after the edit $\endgroup$ Commented Jan 8, 2018 at 19:56
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    $\begingroup$ @DominicvanderZypen No problems. You made a correct decision. Uri Bader was the first and had a brilliant idea. $\endgroup$ Commented Jan 8, 2018 at 20:01