Definition df-8 8943

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 8935	. 2 class 8
2		c7 8934	. . 3 class 7
3		c1 7775	. . 3 class 1
4		caddc 7777	. . 3 class +
5	2, 3, 4	co 5853	. 2 class (7 + 1)
6	1, 5	wceq 1348	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  8963  8pos  8981  8m1e7  9003  7p1e8  9017  4p4e8  9023  5p3e8  9025  6p2e8  9027  7p2e9  9029  8nn  9045  7lt8  9068  8p8e16  9428  9p8e17  9435  9p9e18  9436  8t8e64  9463  9t8e72  9470