Definition df-7 7978

Description: Define the number 7. (Contributed by NM, 27-May-1999.)

Assertion

Ref	Expression
df-7	|- 7 = ( 6 + 1 )

Detailed syntax breakdown of Definition df-7

Step	Hyp	Ref	Expression
1		c7 7969	. 2 class 7
2		c6 7968	. . 3 class 6
3		c1 6890	. . 3 class 1
4		caddc 6892	. . 3 class +
5	2, 3, 4	co 5512	. 2 class ( 6 + 1 )
6	1, 5	wceq 1243	1 wff 7 = ( 6 + 1 )

This definition is referenced by:  7re  7998  7pos  8018  6p1e7  8048  4p3e7  8055  5p2e7  8057  6p2e8  8061  7nn  8082  6lt7  8101  7p7e14  8422  8p7e15  8427  9p7e16  8434  9p8e17  8435  7t7e49  8454  8t7e56  8460  9t7e63  8467