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Definition df-n0 10147
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 10146 . 2  class  NN0
2 cn 9925 . . 3  class  NN
3 cc0 8916 . . . 4  class  0
43csn 3750 . . 3  class  { 0 }
52, 4cun 3254 . 2  class  ( NN  u.  { 0 } )
61, 5wceq 1649 1  wff  NN0  =  ( NN  u.  { 0 } )
Colors of variables: wff set class
This definition is referenced by:  elnn0  10148  nnssnn0  10149  nn0ssre  10150  nn0ex  10152  dfn2  10159  nn0addcl  10180  nn0mulcl  10181  nn0ssz  10227
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