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- No fixed "polynomial variable"
__x__. - Polynomial domains
**R**[`x`],**Q**[`y`],**C**[`z`].- Coefficient domain
**R**,**Q**,**C**. - Polynomial variable
`x`,`y`,`z`. **Q**[`y`]:`y`= [0, 1, 0, 0, 0, ...].

- Coefficient domain
- Multivariate polynomials
**R**[`x`,`y`]**R**[`x`,`y`] = (**R**[`x`])[`y`].- Coefficients are themselves polynomials.

*Generalization to arbitrary number of variables.*

Author: Wolfgang Schreiner

Last Modification: November 16, 1999