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Definition df-n0 9176
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 9175 . 2 class 0
2 cn 8918 . . 3 class
3 cc0 7810 . . . 4 class 0
43csn 3592 . . 3 class {0}
52, 4cun 3127 . 2 class (ℕ ∪ {0})
61, 5wceq 1353 1 wff 0 = (ℕ ∪ {0})
Colors of variables: wff set class
This definition is referenced by:  elnn0  9177  nnssnn0  9178  nn0ssre  9179  nn0ex  9181  dfn2  9188  nn0addcl  9210  nn0mulcl  9211  nn0ssz  9270  dvdsprmpweqnn  12334
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