Definition df-9 5932

Description: Define the number 9.

Assertion

Ref	Expression
df-9	|- 9 = (8 + 1)

Detailed syntax breakdown of Definition df-9

Step	Hyp	Ref	Expression
1		c9 5923	. 2 class 9
2		c8 5922	. . 3 class 8
3		c1 5215	. . 3 class 1
4		caddc 5217	. . 3 class +
5	2, 3, 4	co 3954	. 2 class (8 + 1)
6	1, 5	wceq 954	1 wff 9 = (8 + 1)

This definition is referenced by:  9re 5942  9pos 5952  5p4e9 5969  6p3e9 5972  7p2e9 5974  8p2e10 5976  cos2bnd 7425

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