August 9th, 2017, 04:03 PM  #11 
Senior Member Joined: Aug 2012 Posts: 1,659 Thanks: 427  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 04:06 PM. 

Tags 
irrational, prove, sum 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Prove $X^{(1/n)}$ is an irrational if $p=prime$  complicatemodulus  Number Theory  4  May 2nd, 2016 05:50 AM 
how do you prove 'e' is irrational?  mike1127  Calculus  1  April 7th, 2016 04:32 PM 
Prove nth root of 2 is irrational  shunya  Elementary Math  1  June 30th, 2014 02:06 PM 
Prove 1+sqrt(3) is irrational  shunya  Algebra  3  March 28th, 2014 10:52 PM 
Prove that if x is irrational then  thedarjeeling  Real Analysis  1  February 4th, 2012 03:21 PM 