Definition df-8 8809

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 8801	. 2 class 8
2		c7 8800	. . 3 class 7
3		c1 7645	. . 3 class 1
4		caddc 7647	. . 3 class +
5	2, 3, 4	co 5782	. 2 class (7 + 1)
6	1, 5	wceq 1332	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  8829  8pos  8847  8m1e7  8869  7p1e8  8883  4p4e8  8889  5p3e8  8891  6p2e8  8893  7p2e9  8895  8nn  8911  7lt8  8934  8p8e16  9291  9p8e17  9298  9p9e18  9299  8t8e64  9326  9t8e72  9333