August 9th, 2017, 03:03 PM  #11 
Senior Member Joined: Aug 2012 Posts: 1,428 Thanks: 352  cjem's post #8 is entirely correct. Mathman misspoke himself, confusing the expression in the original post with the wellknown series for $e^x$, as cjem noted. Last edited by Maschke; August 9th, 2017 at 03:06 PM. 

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irrational, prove, sum 
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