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Definition df-n0 7938
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 7937 . 2 class 0
2 cn 7675 . . 3 class
3 cc0 6691 . . . 4 class 0
43csn 3367 . . 3 class {0}
52, 4cun 2909 . 2 class (ℕ ∪ {0})
61, 5wceq 1242 1 wff 0 = (ℕ ∪ {0})
Colors of variables: wff set class
This definition is referenced by:  elnn0  7939  nnssnn0  7940  nn0ssre  7941  nn0ex  7943  dfn2  7950  nn0addcl  7973  nn0mulcl  7974  nn0ssz  8019
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