Definition df-8 9136

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 9128	. 2 class 8
2		c7 9127	. . 3 class 7
3		c1 7961	. . 3 class 1
4		caddc 7963	. . 3 class +
5	2, 3, 4	co 5967	. 2 class ( 7 + 1 )
6	1, 5	wceq 1373	1 wff 8 = ( 7 + 1 )

This definition is referenced by:  8re  9156  8pos  9174  8m1e7  9196  7p1e8  9211  4p4e8  9217  5p3e8  9219  6p2e8  9221  7p2e9  9223  8nn  9239  7lt8  9262  8p8e16  9624  9p8e17  9631  9p9e18  9632  8t8e64  9659  9t8e72  9666