Definition df-n0 6102

Description: Define the set of nonnegative integers.

Assertion

Ref	Expression
df-n0	|- NN0 = (NN u. {0})

Detailed syntax breakdown of Definition df-n0

Step	Hyp	Ref	Expression
1		cn0 5309	. 2 class NN0
2		cn 5308	. . 3 class NN
3		cc0 5246	. . . 4 class 0
4	3	csn 2413	. . 3 class {0}
5	2, 4	cun 2048	. 2 class (NN u. {0})
6	1, 5	wceq 958	1 wff NN0 = (NN u. {0})

This definition is referenced by:  elnn0 6103  nnssnn0 6104  nn0ssre 6105  nn0ssz 6154

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