Definition df-8 9047

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 9039	. 2 class 8
2		c7 9038	. . 3 class 7
3		c1 7873	. . 3 class 1
4		caddc 7875	. . 3 class +
5	2, 3, 4	co 5918	. 2 class ( 7 + 1 )
6	1, 5	wceq 1364	1 wff 8 = ( 7 + 1 )

This definition is referenced by:  8re  9067  8pos  9085  8m1e7  9107  7p1e8  9121  4p4e8  9127  5p3e8  9129  6p2e8  9131  7p2e9  9133  8nn  9149  7lt8  9172  8p8e16  9533  9p8e17  9540  9p9e18  9541  8t8e64  9568  9t8e72  9575