Give an example to show that it is not true ,ingeneral ,that :

sup(AB)=sup(A)sup(B) and inf (AB)=inf(A)inf(B)

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- Aug 17th 2009, 12:37 PMflower3real analysis
Give an example to show that it is not true ,ingeneral ,that :

sup(AB)=sup(A)sup(B) and inf (AB)=inf(A)inf(B) - Aug 17th 2009, 01:23 PMBruno J.
Hint for the first one:

- Aug 17th 2009, 02:17 PMputnam120
Also consider and .

- Aug 17th 2009, 02:57 PMPlato
- Aug 18th 2009, 12:32 AMOpalg