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Is the relation ↖ an equivalence relation or not ??

I know we are supposed to prove that it is reflexive , transitive and symmetric . I found that it is an equivalence relation but i am not sure , so can you please take a look and tell me if it is correct or not ??

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    Are you sure that it’s transitive? What if $a=0,b=10$, and $c=20$?2012-11-30
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    Yes , you are right . It is not transitive in this case . Thank you so much. I appreciate your help.2012-11-30
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    You’re welcome.2012-11-30
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    @BrianM.Scott It seems your question/comment was "spot on." Perhaps you'd like to post an answer to the question?2012-11-30
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    @amWhy: Done! $~$2012-11-30

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