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Definition df-ni 7076
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 7044 . 2 class N
2 com 4472 . . 3 class ω
3 c0 3331 . . . 4 class
43csn 3495 . . 3 class {∅}
52, 4cdif 3036 . 2 class (ω ∖ {∅})
61, 5wceq 1314 1 wff N = (ω ∖ {∅})
Colors of variables: wff set class
This definition is referenced by:  elni  7080  pinn  7081  niex  7084  dmaddpi  7097  dmmulpi  7098
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