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Definition df-ni 6807
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.  =  ( om  \  { (/) } )

Detailed syntax breakdown of Definition df-ni
StepHypRef Expression
1 cnpi 6775 . 2  class  N.
2 com 4378 . . 3  class  om
3 c0 3275 . . . 4  class  (/)
43csn 3431 . . 3  class  { (/) }
52, 4cdif 2985 . 2  class  ( om 
\  { (/) } )
61, 5wceq 1287 1  wff  N.  =  ( om  \  { (/) } )
Colors of variables: wff set class
This definition is referenced by:  elni  6811  pinn  6812  niex  6815  dmaddpi  6828  dmmulpi  6829
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