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August 16th, 2017, 04:59 AM  #11 
Senior Member Joined: Aug 2017 From: United Kingdom Posts: 119 Thanks: 38 Math Focus: Algebraic Number Theory, Arithmetic Geometry  
August 16th, 2017, 05:33 AM  #12 
Math Team Joined: Jul 2013 From: काठमाडौं, नेपाल Posts: 876 Thanks: 60 Math Focus: सामान्य गणित 
I said so because there were only two sets in his example.

August 16th, 2017, 06:31 AM  #13 
Senior Member Joined: Aug 2017 From: United Kingdom Posts: 119 Thanks: 38 Math Focus: Algebraic Number Theory, Arithmetic Geometry  Ah, then perhaps you should have said "o (A) = number of elements in A that are not in B" rather than "o (A) = number of elements that belong to only A (should not belong to other sets)". They are very different statements!

August 16th, 2017, 07:19 AM  #14 
Math Team Joined: Jul 2013 From: काठमाडौं, नेपाल Posts: 876 Thanks: 60 Math Focus: सामान्य गणित  

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cardinality, proof, sets, union 
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