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Definition df-n0 9177
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 9176 . 2 class 0
2 cn 8919 . . 3 class
3 cc0 7811 . . . 4 class 0
43csn 3593 . . 3 class {0}
52, 4cun 3128 . 2 class (ℕ ∪ {0})
61, 5wceq 1353 1 wff 0 = (ℕ ∪ {0})
Colors of variables: wff set class
This definition is referenced by:  elnn0  9178  nnssnn0  9179  nn0ssre  9180  nn0ex  9182  dfn2  9189  nn0addcl  9211  nn0mulcl  9212  nn0ssz  9271  dvdsprmpweqnn  12335
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