Prove that has no solution .

*Proof.*From Theorem I.20 we know that if , then . From Theorem I.21 we know . Thus, if , then . On the other hand, if , then . Hence, there is no such that

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Stumbling Robot

A Fraction of a Dot
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There is no real number that is the square root of -1

* Proof. * From Theorem I.20 we know that if , then . From Theorem I.21 we know . Thus, if , then . On the other hand, if , then . Hence, there is no such that

Prove that has no solution .