5. If x is rational and y is irrational, then x + y is irrational.

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Assume that F is an ordered field with at least one irrational element.

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5. If x is rational and y is irrational, then x + y is irrational.
6. If x #0 is rational and y is irrational, then xy is irrational.
7. If r is irrational, then so are -x and x-¹.
8. The set of irrationals is not closed under addition.
9. The set of irrationals is not closed under multiplication.
10. F contains infinitely many irrational elements.
Transcribed Image Text:5. If x is rational and y is irrational, then x + y is irrational. 6. If x #0 is rational and y is irrational, then xy is irrational. 7. If r is irrational, then so are -x and x-¹. 8. The set of irrationals is not closed under addition. 9. The set of irrationals is not closed under multiplication. 10. F contains infinitely many irrational elements.
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