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Definition df-n0 8610
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 8609 . 2 class 0
2 cn 8360 . . 3 class
3 cc0 7297 . . . 4 class 0
43csn 3431 . . 3 class {0}
52, 4cun 2986 . 2 class (ℕ ∪ {0})
61, 5wceq 1287 1 wff 0 = (ℕ ∪ {0})
Colors of variables: wff set class
This definition is referenced by:  elnn0  8611  nnssnn0  8612  nn0ssre  8613  nn0ex  8615  dfn2  8622  nn0addcl  8644  nn0mulcl  8645  nn0ssz  8704
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