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Take the domain of natural numbers and assignment
[`x` |-> `1`].

- The proposition
**mlets**`y`= 0:`x`<=`y` - The function
`f`defined as`f`(`x`) :=`s`*`x`+`s`**where**`s`=`x`+1`f`(`x`) := (`x`+1)*`x`+(`x`+1).

Author: Wolfgang Schreiner

Last Modification: October 6, 1999