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- Recursive definitions on
**N**:*: **N**x**N**->**N**`x`*`y`:=**if**`y`= 0**then**0**else**`x`+(`x`*`y`^{-}) - Proposition:
`x`* 0= 0, `x`*`y`'= x+( `x`*`y`).

*Recursive function definition implies pair of equations.*

Author: Wolfgang Schreiner

Last Modification: November 24, 1999