Definition df-8 9171

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 9163	. 2 class 8
2		c7 9162	. . 3 class 7
3		c1 7996	. . 3 class 1
4		caddc 7998	. . 3 class +
5	2, 3, 4	co 6000	. 2 class (7 + 1)
6	1, 5	wceq 1395	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  9191  8pos  9209  8m1e7  9231  7p1e8  9246  4p4e8  9252  5p3e8  9254  6p2e8  9256  7p2e9  9258  8nn  9274  7lt8  9297  8p8e16  9659  9p8e17  9666  9p9e18  9667  8t8e64  9694  9t8e72  9701