- #1

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Hi

Does anybody know if the irrational numbers have the least upper bound property?

Does anybody know if the irrational numbers have the least upper bound property?

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- Thread starter RediJedeye
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- #1

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Hi

Does anybody know if the irrational numbers have the least upper bound property?

Does anybody know if the irrational numbers have the least upper bound property?

- #2

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Hi

Does anybody know if the irrational numbers have the least upper bound property?

The set of irrationals less than zero is nonempty (it contains -pi, for example) and is bounded above (by pi, for example) yet has no least upper bound. So the irrationals do not satisfy the LUB property.

Of course zero is a LUB for that set

- #3

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Cool that makes perfect sense thanks for the help.

- #4

Bacle2

Science Advisor

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consider the intervals (-oo,q) . Notice that the LUB of a subset of real numbers is

a limit point of that set S . So if a subset S of R does not contain all its limit points you

can constructuct a subset of S that does not contain its LUB-- so that closed subsets

contain their LUB's. Think of the relation with completeness of a set...

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