about the subset S⊆Q such that x∈S ⇔18x-x^3≧0 Q is set of rational number. a)how to show S have a maximum or not? b)how to show S have a minimum or not? c)how to show S have supremum or not? d) how to show S have infimum or not?
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Originally Posted by nyammo about the subset S⊆Q such that x∈S ⇔18x-x^3≧0 Q is set of rational number. Take into account that and .
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