Definition df-8 9208

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 9200	. 2 class 8
2		c7 9199	. . 3 class 7
3		c1 8033	. . 3 class 1
4		caddc 8035	. . 3 class +
5	2, 3, 4	co 6018	. 2 class (7 + 1)
6	1, 5	wceq 1397	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  9228  8pos  9246  8m1e7  9268  7p1e8  9283  4p4e8  9289  5p3e8  9291  6p2e8  9293  7p2e9  9295  8nn  9311  7lt8  9334  8p8e16  9696  9p8e17  9703  9p9e18  9704  8t8e64  9731  9t8e72  9738