Definition df-8 9103

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 9095	. 2 class 8
2		c7 9094	. . 3 class 7
3		c1 7928	. . 3 class 1
4		caddc 7930	. . 3 class +
5	2, 3, 4	co 5946	. 2 class ( 7 + 1 )
6	1, 5	wceq 1373	1 wff 8 = ( 7 + 1 )

This definition is referenced by:  8re  9123  8pos  9141  8m1e7  9163  7p1e8  9178  4p4e8  9184  5p3e8  9186  6p2e8  9188  7p2e9  9190  8nn  9206  7lt8  9229  8p8e16  9591  9p8e17  9598  9p9e18  9599  8t8e64  9626  9t8e72  9633