Proving an irrational to an irrational is rational

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Homework Help Overview

The discussion revolves around the concept of proving that an irrational number raised to another irrational number can yield a rational result. The specific example mentioned involves the expression \(\sqrt{2}^{\sqrt{2}^{\sqrt{2}}}\).

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants explore the implications of \(\sqrt{2}^{\sqrt{2}}\) being rational or irrational and how that affects the overall expression. There is a request for hints regarding the irrationality of \(\sqrt{2}^{\sqrt{2}}\).

Discussion Status

The discussion is active, with participants considering different scenarios based on the rationality of \(\sqrt{2}^{\sqrt{2}}\). Some guidance has been offered regarding the implications of the assumptions made, but no consensus has been reached on the irrationality of the initial expression.

Contextual Notes

Participants are navigating the challenge of proving the irrationality of \(\sqrt{2}^{\sqrt{2}}\) while also considering the broader implications of irrational exponents. There is an acknowledgment of the complexity involved in proving such properties.

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Homework Statement


prove that it is possible that an irrational number raised to another irrational, can be rational.
you are given root2 to root2 to root2


Homework Equations





The Attempt at a Solution


i have shown that root2 to root2 to root2 is rational, but would appreciate a hint on showing root2 to root2 is irrational
 
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Suppose [itex]\sqrt{2}^\sqrt{2}[/itex] is rational. Then you are done!

If it is not rational, then
[tex]\left(\sqrt{2}^\sqrt{2}\right)^\sqrt{2}[/tex]
is again an "irrational to an irrational power".

Now, what is
[tex]\left(\sqrt{2}^\sqrt{2}\right)^\sqrt{2}[/tex]?

Do you see how, even though we don't know whether [itex]\sqrt{2}^\sqrt{2}[/itex] is rational or irrational, either way we have an irrational number to an irrational power that is rational?
 
Last edited by a moderator:
wow, i thought you somehow had to prove it. Thanks
 
Either that or get someone to prove it for you!
 

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