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Definition df-n0 8936
Description: Define the set of nonnegative integers. (Contributed by Raph Levien, 10-Dec-2002.)
Assertion
Ref Expression
df-n0 0 = (ℕ ∪ {0})

Detailed syntax breakdown of Definition df-n0
StepHypRef Expression
1 cn0 8935 . 2 class 0
2 cn 8684 . . 3 class
3 cc0 7588 . . . 4 class 0
43csn 3497 . . 3 class {0}
52, 4cun 3039 . 2 class (ℕ ∪ {0})
61, 5wceq 1316 1 wff 0 = (ℕ ∪ {0})
Colors of variables: wff set class
This definition is referenced by:  elnn0  8937  nnssnn0  8938  nn0ssre  8939  nn0ex  8941  dfn2  8948  nn0addcl  8970  nn0mulcl  8971  nn0ssz  9030
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