Definition df-8 9131

Description: Define the number 8. (Contributed by NM, 27-May-1999.)

Assertion

Ref	Expression
df-8	⊢ 8 = (7 + 1)

Detailed syntax breakdown of Definition df-8

Step	Hyp	Ref	Expression
1		c8 9123	. 2 class 8
2		c7 9122	. . 3 class 7
3		c1 7956	. . 3 class 1
4		caddc 7958	. . 3 class +
5	2, 3, 4	co 5962	. 2 class (7 + 1)
6	1, 5	wceq 1373	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  9151  8pos  9169  8m1e7  9191  7p1e8  9206  4p4e8  9212  5p3e8  9214  6p2e8  9216  7p2e9  9218  8nn  9234  7lt8  9257  8p8e16  9619  9p8e17  9626  9p9e18  9627  8t8e64  9654  9t8e72  9661