MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  df-ni Unicode version

Definition df-ni 8705
Description: Define the class of positive integers. This is a "temporary" set used in the construction of complex numbers df-c 8952, 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 8675 . 2  class  N.
2 com 4804 . . 3  class  om
3 c0 3588 . . . 4  class  (/)
43csn 3774 . . 3  class  { (/) }
52, 4cdif 3277 . 2  class  ( om 
\  { (/) } )
61, 5wceq 1649 1  wff  N.  =  ( om  \  { (/) } )
Colors of variables: wff set class
This definition is referenced by:  elni  8709  pinn  8711  niex  8714  ltsopi  8721  dmaddpi  8723  dmmulpi  8724  wuncn  9001
  Copyright terms: Public domain W3C validator