Find a nonempty subset of Q (rational numbers) that is bounded above but has no least upper bound in Q. Justify your claim. Thanks for the help!

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- May 5th 2011, 08:51 AMjstarks44444Nonempty Subset of Q
Find a nonempty subset of Q (rational numbers) that is bounded above but has no least upper bound in Q. Justify your claim. Thanks for the help!

- May 5th 2011, 08:56 AMTheEmptySet
- May 5th 2011, 08:57 AMPlato
- May 6th 2011, 07:12 PMDeveno
in general, any set Q ∩ (a,b) (where (a,b) is an open interval of the reals) where b is irrational will do. why is this so?