Definition df-8 8978

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 8970	. 2 class 8
2		c7 8969	. . 3 class 7
3		c1 7807	. . 3 class 1
4		caddc 7809	. . 3 class +
5	2, 3, 4	co 5870	. 2 class (7 + 1)
6	1, 5	wceq 1353	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  8998  8pos  9016  8m1e7  9038  7p1e8  9052  4p4e8  9058  5p3e8  9060  6p2e8  9062  7p2e9  9064  8nn  9080  7lt8  9103  8p8e16  9463  9p8e17  9470  9p9e18  9471  8t8e64  9498  9t8e72  9505