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| Math Central | Quandaries & Queries |
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Question from asif, a student: show that (-1,1)~(1,1) or give its counter example |
Asif,
The subject line of your email was "equivalent set".
If the sets $(-1,1)$ and $(1, 1)$ are open intervals on the real line then they can't be equivalent since $(1, 1)$ is empty and $(-1, 1)$ is not.
Harley
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