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Definition df-ni 6150
Description: Define the class of positive integers. This is a "temporary" set used in the construction of complex numbers, and is intended to be used only by the construction. (Contributed by NM, 15-Aug-1995.)
Assertion
Ref Expression
df-ni N = (𝜔 ∖ {∅})

Detailed syntax breakdown of Definition df-ni
StepHypRef Expression
1 cnpi 6118 . 2 class N
2 com 4228 . . 3 class 𝜔
3 c0 3192 . . . 4 class
43csn 3339 . . 3 class {∅}
52, 4cdif 2882 . 2 class (𝜔 ∖ {∅})
61, 5wceq 1223 1 wff N = (𝜔 ∖ {∅})
Colors of variables: wff set class
This definition is referenced by:  elni  6154  pinn  6155  niex  6158  dmaddpi  6171  dmmulpi  6172
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