Definition df-8 8922

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 8914	. 2 class 8
2		c7 8913	. . 3 class 7
3		c1 7754	. . 3 class 1
4		caddc 7756	. . 3 class +
5	2, 3, 4	co 5842	. 2 class (7 + 1)
6	1, 5	wceq 1343	1 wff 8 = (7 + 1)

This definition is referenced by:  8re  8942  8pos  8960  8m1e7  8982  7p1e8  8996  4p4e8  9002  5p3e8  9004  6p2e8  9006  7p2e9  9008  8nn  9024  7lt8  9047  8p8e16  9407  9p8e17  9414  9p9e18  9415  8t8e64  9442  9t8e72  9449