Definition df-8 8643

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 8635	. 2 class 8
2		c7 8634	. . 3 class 7
3		c1 7501	. . 3 class 1
4		caddc 7503	. . 3 class +
5	2, 3, 4	co 5706	. 2 class ( 7 + 1 )
6	1, 5	wceq 1299	1 wff 8 = ( 7 + 1 )

This definition is referenced by:  8re  8663  8pos  8681  7p1e8  8711  4p4e8  8717  5p3e8  8719  6p2e8  8721  7p2e9  8723  8nn  8739  7lt8  8762  8p8e16  9119  9p8e17  9126  9p9e18  9127  8t8e64  9154  9t8e72  9161