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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 is a rational number. Then: , , , 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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