Definition df-8 9319

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 9311	. 2 class 8
2		c7 9310	. . 3 class 7
3		c1 8144	. . 3 class 1
4		caddc 8146	. . 3 class +
5	2, 3, 4	co 6058	. 2 class (7 + 1)
6	1, 5	wceq 1398	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  9339  8pos  9357  8m1e7  9379  7p1e8  9394  4p4e8  9400  5p3e8  9402  6p2e8  9404  7p2e9  9406  8nn  9422  7lt8  9445  8p8e16  9812  9p8e17  9819  9p9e18  9820  8t8e64  9847  9t8e72  9854