| 11. | Every open set is a countable union of such cylinder sets.
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| 12. | This open set can then be used to distinguish between the two points.
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| 13. | The only nonempty convex open set in is the entire space.
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| 14. | The union of open sets U _ i is therefore open.
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| 15. | Where \ chi _ E is the characteristic function on that open set.
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| 16. | The open set U of possible particle positions is a material configuration space.
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| 17. | African Panorama is a large open set of enclosures with overlooks for visitors.
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| 18. | It is sufficient to show that the components of open sets are open.
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| 19. | These open sets form a basis for the topology of the Gromov boundary.
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| 20. | Then there exists an open set G \ subset U such that y.
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