Definition df-8 9207

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 9199	. 2 class 8
2		c7 9198	. . 3 class 7
3		c1 8032	. . 3 class 1
4		caddc 8034	. . 3 class +
5	2, 3, 4	co 6017	. 2 class (7 + 1)
6	1, 5	wceq 1397	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  9227  8pos  9245  8m1e7  9267  7p1e8  9282  4p4e8  9288  5p3e8  9290  6p2e8  9292  7p2e9  9294  8nn  9310  7lt8  9333  8p8e16  9695  9p8e17  9702  9p9e18  9703  8t8e64  9730  9t8e72  9737