Description: The set of positive integers, which is the set of natural numbers _om with 0 removed.
Note: This is the start of the Dedekind-cut construction of real and complex numbers. The last lemma of the construction is mulcnsrec . The actual set of Dedekind cuts is defined by df-np .
| Ref | Expression | ||
|---|---|---|---|
| Assertion | cnpi | class N |