Definition df-8 9250

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 9242	. 2 class 8
2		c7 9241	. . 3 class 7
3		c1 8076	. . 3 class 1
4		caddc 8078	. . 3 class +
5	2, 3, 4	co 6028	. 2 class (7 + 1)
6	1, 5	wceq 1398	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  9270  8pos  9288  8m1e7  9310  7p1e8  9325  4p4e8  9331  5p3e8  9333  6p2e8  9335  7p2e9  9337  8nn  9353  7lt8  9376  8p8e16  9740  9p8e17  9747  9p9e18  9748  8t8e64  9775  9t8e72  9782