Definition df-7 8486

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 8478	. 2 class 7
2		c6 8477	. . 3 class 6
3		c1 7351	. . 3 class 1
4		caddc 7353	. . 3 class +
5	2, 3, 4	co 5652	. 2 class (6 + 1)
6	1, 5	wceq 1289	1 wff 7 = (6 + 1)

This definition is referenced by:  7re  8505  7pos  8524  6p1e7  8554  4p3e7  8560  5p2e7  8562  6p2e8  8565  7nn  8582  6lt7  8600  7p7e14  8955  8p7e15  8961  9p7e16  8968  9p8e17  8969  7t7e49  8990  8t7e56  8996  9t7e63  9003