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Definition df-n0 10212
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 10211 . 2  class  NN0
2 cn 9990 . . 3  class  NN
3 cc0 8980 . . . 4  class  0
43csn 3806 . . 3  class  { 0 }
52, 4cun 3310 . 2  class  ( NN  u.  { 0 } )
61, 5wceq 1652 1  wff  NN0  =  ( NN  u.  { 0 } )
Colors of variables: wff set class
This definition is referenced by:  elnn0  10213  nnssnn0  10214  nn0ssre  10215  nn0ex  10217  dfn2  10224  nn0addcl  10245  nn0mulcl  10246  nn0ssz  10292
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