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Definition df-9 8944
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 8936 . 2 class 9
2 c8 8935 . . 3 class 8
3 c1 7775 . . 3 class 1
4 caddc 7777 . . 3 class +
52, 3, 4co 5853 . 2 class (8 + 1)
61, 5wceq 1348 1 wff 9 = (8 + 1)
Colors of variables: wff set class
This definition is referenced by:  9re  8965  9pos  8982  9m1e8  9004  8p1e9  9018  5p4e9  9026  6p3e9  9028  7p2e9  9029  9nn  9046  8lt9  9075  8p2e10  9422  9p9e18  9436  9t9e81  9471  lgsdir2lem5  13727
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