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Definition df-9 8985
Description: Define the number 9. (Contributed by NM, 27-May-1999.)
Assertion
Ref Expression
df-9 9 = (8 + 1)

Detailed syntax breakdown of Definition df-9
StepHypRef Expression
1 c9 8977 . 2 class 9
2 c8 8976 . . 3 class 8
3 c1 7812 . . 3 class 1
4 caddc 7814 . . 3 class +
52, 3, 4co 5875 . 2 class (8 + 1)
61, 5wceq 1353 1 wff 9 = (8 + 1)
Colors of variables: wff set class
This definition is referenced by:  9re  9006  9pos  9023  9m1e8  9045  8p1e9  9059  5p4e9  9067  6p3e9  9069  7p2e9  9070  9nn  9087  8lt9  9116  8p2e10  9463  9p9e18  9477  9t9e81  9512  lgsdir2lem5  14436  2lgsoddprmlem3d  14461
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