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Definition df-ni 9271
Description: Define the class of positive integers. This is a "temporary" set used in the construction of complex numbers df-c 9519, 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

Detailed syntax breakdown of Definition df-ni
StepHypRef Expression
1 cnpi 9243 . 2
2 com 6700 . . 3
3 c0 3784 . . . 4
43csn 4029 . . 3
52, 4cdif 3472 . 2
61, 5wceq 1395 1
Colors of variables: wff setvar class
This definition is referenced by:  elni  9275  pinn  9277  niex  9280  ltsopi  9287  dmaddpi  9289  dmmulpi  9290  wuncn  9568
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