| 1. | A convex function defined on some open interval is countably many points.
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| 2. | That is why Bourbaki introduced the notation to denote the open interval.
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| 3. | As a special case, the open interval is defined as the cut.
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| 4. | It is a bijection from an open interval to the reals.
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| 5. | As an example let be an open interval and consider
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| 6. | The function f is defined only on the half-open interval [ 0, 2 ).
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| 7. | In this way, open intervals can be more consonant.
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| 8. | Topological spaces are open intervals of the real line.
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| 9. | Burwell wrote open intervals such as the fourth, fifth and ninth, to hide the sentiment.
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| 10. | Open-closed and closed-open intervals are liable to be misunderstood and'fixed'to use round brackets on either side.
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