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- Quotient of two numbers is always is well-defined.
- Between any two rationals, there is another rational.
- Definition on top of
**Z**.**Q**subset**Z**x**Z**.**Z**not subset**Q**!

- We will see later how to "embed"
**Z**into**Q**. - We will see later a "better" construction of
**Q**.

Author: Wolfgang Schreiner

Last Modification: November 16, 1999