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Definition df-n0 8392
Description: Define the set of nonnegative integers. (Contributed by Raph Levien, 10-Dec-2002.)
Assertion
Ref Expression
df-n0  |-  NN0  =  ( NN  u.  { 0 } )

Detailed syntax breakdown of Definition df-n0
StepHypRef Expression
1 cn0 8391 . 2  class  NN0
2 cn 8142 . . 3  class  NN
3 cc0 7079 . . . 4  class  0
43csn 3417 . . 3  class  { 0 }
52, 4cun 2981 . 2  class  ( NN  u.  { 0 } )
61, 5wceq 1285 1  wff  NN0  =  ( NN  u.  { 0 } )
Colors of variables: wff set class
This definition is referenced by:  elnn0  8393  nnssnn0  8394  nn0ssre  8395  nn0ex  8397  dfn2  8404  nn0addcl  8426  nn0mulcl  8427  nn0ssz  8486
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