Definition df-8 9198

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 9190	. 2 class 8
2		c7 9189	. . 3 class 7
3		c1 8023	. . 3 class 1
4		caddc 8025	. . 3 class +
5	2, 3, 4	co 6013	. 2 class (7 + 1)
6	1, 5	wceq 1395	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  9218  8pos  9236  8m1e7  9258  7p1e8  9273  4p4e8  9279  5p3e8  9281  6p2e8  9283  7p2e9  9285  8nn  9301  7lt8  9324  8p8e16  9686  9p8e17  9693  9p9e18  9694  8t8e64  9721  9t8e72  9728