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Definition df-9 8779
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 8771 . 2 class 9
2 c8 8770 . . 3 class 8
3 c1 7614 . . 3 class 1
4 caddc 7616 . . 3 class +
52, 3, 4co 5767 . 2 class (8 + 1)
61, 5wceq 1331 1 wff 9 = (8 + 1)
Colors of variables: wff set class
This definition is referenced by:  9re  8800  9pos  8817  9m1e8  8839  8p1e9  8853  5p4e9  8861  6p3e9  8863  7p2e9  8864  9nn  8881  8lt9  8910  8p2e10  9254  9p9e18  9268  9t9e81  9303
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