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This is your very first post. Click the Edit link to modify or delete it, or start a new post. If you like, use this post to tell readers why you started this blog.

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Describe the following sets of real numbers geometrically:

**Solution:** Let be as defined above.

- The set describes the ray extending from to , but not including .
- Note that or . So represents both a closed ray at extending to and a closed ray at extending to .
- The set describes the two points on the real line, because or .