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 June 5th, 2014, 06:26 AM #1 Member     Joined: Jun 2014 From: Math Forum Posts: 67 Thanks: 4 irrational Last edited by brhum; June 5th, 2014 at 06:30 AM.
 June 5th, 2014, 08:57 AM #2 Senior Member     Joined: Mar 2011 From: Chicago, IL Posts: 214 Thanks: 77 Indirect proof. Assume that $log_76$ is a rational number. Then: $log_76=\frac{m}{n}$, $7^{\frac{m}{n}}=6$, $7^m=6^n=2^n3^n$, that means that 7 is a multiple of 2. It is false.
 June 6th, 2014, 10:55 AM #3 Senior Member     Joined: Apr 2014 From: zagreb, croatia Posts: 234 Thanks: 33 Math Focus: philosophy/found of math, metamath, logic, set/category/order/number theory, algebra, topology

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