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Definition df-n0 9982
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 9981 . 2  class  NN0
2 cn 9762 . . 3  class  NN
3 cc0 8753 . . . 4  class  0
43csn 3653 . . 3  class  { 0 }
52, 4cun 3163 . 2  class  ( NN  u.  { 0 } )
61, 5wceq 1632 1  wff  NN0  =  ( NN  u.  { 0 } )
Colors of variables: wff set class
This definition is referenced by:  elnn0  9983  nnssnn0  9984  nn0ssre  9985  nn0ex  9987  dfn2  9994  nn0addcl  10015  nn0mulcl  10016  nn0ssz  10060
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