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Definition df-ni 6288
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 6256 . 2  N.
2 com 4256 . . 3  om
3 c0 3218 . . . 4  (/)
43csn 3367 . . 3  { (/) }
52, 4cdif 2908 . 2  om  \  { (/) }
61, 5wceq 1242 1  N.  om  \  { (/) }
Colors of variables: wff set class
This definition is referenced by:  elni  6292  pinn  6293  niex  6296  dmaddpi  6309  dmmulpi  6310
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