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Definition df-n0 9001
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 9000 . 2 class 0
2 cn 8743 . . 3 class
3 cc0 7643 . . . 4 class 0
43csn 3531 . . 3 class {0}
52, 4cun 3073 . 2 class (ℕ ∪ {0})
61, 5wceq 1332 1 wff 0 = (ℕ ∪ {0})
Colors of variables: wff set class
This definition is referenced by:  elnn0  9002  nnssnn0  9003  nn0ssre  9004  nn0ex  9006  dfn2  9013  nn0addcl  9035  nn0mulcl  9036  nn0ssz  9095
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