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Mirrors > Home > MPE Home > Th. List > df-ni | Structured version Visualization version Unicode version |
Description: Define the class of positive integers. This is a "temporary" set used in the construction of complex numbers df-c 9942, and is intended to be used only by the construction. (Contributed by NM, 15-Aug-1995.) (New usage is discouraged.) |
Ref | Expression |
---|---|
df-ni |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cnpi 9666 | . 2 | |
2 | com 7065 | . . 3 | |
3 | c0 3915 | . . . 4 | |
4 | 3 | csn 4177 | . . 3 |
5 | 2, 4 | cdif 3571 | . 2 |
6 | 1, 5 | wceq 1483 | 1 |
Colors of variables: wff setvar class |
This definition is referenced by: elni 9698 pinn 9700 niex 9703 ltsopi 9710 dmaddpi 9712 dmmulpi 9713 wuncn 9991 |
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