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Definition df-ni 10282
Description: Define the class of positive integers. This is a "temporary" set used in the construction of complex numbers df-c 10531, and is intended to be used only by the construction. (Contributed by NM, 15-Aug-1995.) (New usage is discouraged.)
Assertion
Ref Expression
df-ni N = (ω ∖ {∅})

Detailed syntax breakdown of Definition df-ni
StepHypRef Expression
1 cnpi 10254 . 2 class N
2 com 7569 . . 3 class ω
3 c0 4288 . . . 4 class
43csn 4557 . . 3 class {∅}
52, 4cdif 3930 . 2 class (ω ∖ {∅})
61, 5wceq 1528 1 wff N = (ω ∖ {∅})
Colors of variables: wff setvar class
This definition is referenced by:  elni  10286  pinn  10288  niex  10291  ltsopi  10298  dmaddpi  10300  dmmulpi  10301  wuncn  10580
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