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Definition df-n0 7958
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 7957 . 2  NN0
2 cn 7695 . . 3  NN
3 cc0 6711 . . . 4  0
43csn 3367 . . 3  { 0 }
52, 4cun 2909 . 2  NN  u.  { 0 }
61, 5wceq 1242 1  NN0  NN  u.  { 0 }
Colors of variables: wff set class
This definition is referenced by:  elnn0  7959  nnssnn0  7960  nn0ssre  7961  nn0ex  7963  dfn2  7970  nn0addcl  7993  nn0mulcl  7994  nn0ssz  8039
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