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**C**is complete with respect to + and *.- All equations have solutions in
**C**.

- All equations have solutions in
- Definition on top of
**R**.**C**=**R**x**R**.**R**not subset**C**!*Cartesian coordinates*.

- We will see later how to "embed"
**R**into**C**. - We will see later another definition of
**C**(*polar coordinates*).

Author: Wolfgang Schreiner

Last Modification: November 16, 1999