Definition df-8 9055

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 9047	. 2 class 8
2		c7 9046	. . 3 class 7
3		c1 7880	. . 3 class 1
4		caddc 7882	. . 3 class +
5	2, 3, 4	co 5922	. 2 class ( 7 + 1 )
6	1, 5	wceq 1364	1 wff 8 = ( 7 + 1 )

This definition is referenced by:  8re  9075  8pos  9093  8m1e7  9115  7p1e8  9130  4p4e8  9136  5p3e8  9138  6p2e8  9140  7p2e9  9142  8nn  9158  7lt8  9181  8p8e16  9542  9p8e17  9549  9p9e18  9550  8t8e64  9577  9t8e72  9584