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Definition df-ni 8741
Description: Define the class of positive integers. This is a "temporary" set used in the construction of complex numbers df-c 8988, 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.  =  ( om  \  { (/) } )

Detailed syntax breakdown of Definition df-ni
StepHypRef Expression
1 cnpi 8711 . 2  class  N.
2 com 4837 . . 3  class  om
3 c0 3620 . . . 4  class  (/)
43csn 3806 . . 3  class  { (/) }
52, 4cdif 3309 . 2  class  ( om 
\  { (/) } )
61, 5wceq 1652 1  wff  N.  =  ( om  \  { (/) } )
Colors of variables: wff set class
This definition is referenced by:  elni  8745  pinn  8747  niex  8750  ltsopi  8757  dmaddpi  8759  dmmulpi  8760  wuncn  9037
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