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Definition df-ni 9056
Description: Define the class of positive integers. This is a "temporary" set used in the construction of complex numbers df-c 9303, 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 9026 . 2  class  N.
2 com 6491 . . 3  class  om
3 c0 3652 . . . 4  class  (/)
43csn 3892 . . 3  class  { (/) }
52, 4cdif 3340 . 2  class  ( om 
\  { (/) } )
61, 5wceq 1369 1  wff  N.  =  ( om  \  { (/) } )
Colors of variables: wff setvar class
This definition is referenced by:  elni  9060  pinn  9062  niex  9065  ltsopi  9072  dmaddpi  9074  dmmulpi  9075  wuncn  9352
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