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Definition df-ni 7224
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 7192 . 2 class N
2 com 4549 . . 3 class ω
3 c0 3394 . . . 4 class
43csn 3560 . . 3 class {∅}
52, 4cdif 3099 . 2 class (ω ∖ {∅})
61, 5wceq 1335 1 wff N = (ω ∖ {∅})
Colors of variables: wff set class
This definition is referenced by:  elni  7228  pinn  7229  niex  7232  dmaddpi  7245  dmmulpi  7246
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