Definition df-6 9099

Description: Define the number 6. (Contributed by NM, 27-May-1999.)

Assertion

Ref	Expression
df-6	|- 6 = ( 5 + 1 )

Detailed syntax breakdown of Definition df-6

Step	Hyp	Ref	Expression
1		c6 9091	. 2 class 6
2		c5 9090	. . 3 class 5
3		c1 7926	. . 3 class 1
4		caddc 7928	. . 3 class +
5	2, 3, 4	co 5944	. 2 class ( 5 + 1 )
6	1, 5	wceq 1373	1 wff 6 = ( 5 + 1 )

This definition is referenced by:  6re  9117  6pos  9137  6m1e5  9159  5p1e6  9174  3p3e6  9179  4p2e6  9180  5p2e7  9183  6nn  9202  5lt6  9216  6p6e12  9577  7p6e13  9581  8p6e14  9587  8p8e16  9589  9p6e15  9594  9p7e16  9595  6t6e36  9611  7t6e42  9616  8t6e48  9622  9t6e54  9629  lgsdir2lem3  15507  2lgsoddprmlem3d  15587