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Definition df-n0 9153
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 9152 . 2 class 0
2 cn 8895 . . 3 class
3 cc0 7789 . . . 4 class 0
43csn 3591 . . 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  9154  nnssnn0  9155  nn0ssre  9156  nn0ex  9158  dfn2  9165  nn0addcl  9187  nn0mulcl  9188  nn0ssz  9247  dvdsprmpweqnn  12305
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