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v.rad
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1. sup (empty set) = -infinity, and if V is not bounded above, then sup V = +infinity. Prove if V[tex]\subseteq[/tex]W[tex]\subseteq[/tex]Real Numbers then sup V is lessthan/equalto supW
3. I used a proof by contrapositive, but I'm not sure if it is completely valid...
3. I used a proof by contrapositive, but I'm not sure if it is completely valid...