Definition df-8 9175

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 9167	. 2 class 8
2		c7 9166	. . 3 class 7
3		c1 8000	. . 3 class 1
4		caddc 8002	. . 3 class +
5	2, 3, 4	co 6001	. 2 class (7 + 1)
6	1, 5	wceq 1395	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  9195  8pos  9213  8m1e7  9235  7p1e8  9250  4p4e8  9256  5p3e8  9258  6p2e8  9260  7p2e9  9262  8nn  9278  7lt8  9301  8p8e16  9663  9p8e17  9670  9p9e18  9671  8t8e64  9698  9t8e72  9705