Definition df-8 8983

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 8975	. 2 class 8
2		c7 8974	. . 3 class 7
3		c1 7811	. . 3 class 1
4		caddc 7813	. . 3 class +
5	2, 3, 4	co 5874	. 2 class (7 + 1)
6	1, 5	wceq 1353	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  9003  8pos  9021  8m1e7  9043  7p1e8  9057  4p4e8  9063  5p3e8  9065  6p2e8  9067  7p2e9  9069  8nn  9085  7lt8  9108  8p8e16  9468  9p8e17  9475  9p9e18  9476  8t8e64  9503  9t8e72  9510