Definition df-7 8547

Description: Define the number 7. (Contributed by NM, 27-May-1999.)

Assertion

Ref	Expression
df-7	⊢ 7 = (6 + 1)

Detailed syntax breakdown of Definition df-7

Step	Hyp	Ref	Expression
1		c7 8539	. 2 class 7
2		c6 8538	. . 3 class 6
3		c1 7412	. . 3 class 1
4		caddc 7414	. . 3 class +
5	2, 3, 4	co 5666	. 2 class (6 + 1)
6	1, 5	wceq 1290	1 wff 7 = (6 + 1)

This definition is referenced by:  7re  8566  7pos  8585  6p1e7  8615  4p3e7  8621  5p2e7  8623  6p2e8  8626  7nn  8643  6lt7  8661  7p7e14  9016  8p7e15  9022  9p7e16  9029  9p8e17  9030  7t7e49  9051  8t7e56  9057  9t7e63  9064