Definition df-n0 7309

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 6450	. 2 class NN0
2		cn 6449	. . 3 class NN
3		cc0 6386	. . . 4 class 0
4	3	csn 3044	. . 3 class {0}
5	2, 4	cun 2591	. 2 class (NN u. {0})
6	1, 5	wceq 1298	1 wff NN0 = (NN u. {0})

This definition is referenced by:  elnn0 7310  nnssnn0 7311  nn0ssre 7312  nn0ssz 7361

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