Definition df-8 8984

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 8976	. 2 class 8
2		c7 8975	. . 3 class 7
3		c1 7812	. . 3 class 1
4		caddc 7814	. . 3 class +
5	2, 3, 4	co 5875	. 2 class ( 7 + 1 )
6	1, 5	wceq 1353	1 wff 8 = ( 7 + 1 )

This definition is referenced by:  8re  9004  8pos  9022  8m1e7  9044  7p1e8  9058  4p4e8  9064  5p3e8  9066  6p2e8  9068  7p2e9  9070  8nn  9086  7lt8  9109  8p8e16  9469  9p8e17  9476  9p9e18  9477  8t8e64  9504  9t8e72  9511