Definition df-8 8955

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 8947	. 2 class 8
2		c7 8946	. . 3 class 7
3		c1 7787	. . 3 class 1
4		caddc 7789	. . 3 class +
5	2, 3, 4	co 5865	. 2 class (7 + 1)
6	1, 5	wceq 1353	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  8975  8pos  8993  8m1e7  9015  7p1e8  9029  4p4e8  9035  5p3e8  9037  6p2e8  9039  7p2e9  9041  8nn  9057  7lt8  9080  8p8e16  9440  9p8e17  9447  9p9e18  9448  8t8e64  9475  9t8e72  9482