Metamath Proof Explorer

Syntax definition cnpi

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