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    Real Analysis - Simple supremum/infimum problem

    Homework Statement If S = { 1/n - 1/m | n, m \in N}, find inf(S) and sup(S) I'm having a really hard time wrapping my head around the proper way to tackle sumpremum and infimum problems. I've included the little that I've done thus far, I just need a nudge in the right direction. Correct me...
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