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Definition df-9 7978
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 7969 . 2 class 9
2 c8 7968 . . 3 class 8
3 c1 6888 . . 3 class 1
4 caddc 6890 . . 3 class +
52, 3, 4co 5512 . 2 class (8 + 1)
61, 5wceq 1243 1 wff 9 = (8 + 1)
Colors of variables: wff set class
This definition is referenced by:  9re  8000  9pos  8018  8p1e9  8048  5p4e9  8057  6p3e9  8060  7p2e9  8062  8p2e10  8064  9nn  8082  8lt9  8112  9p9e18  8434  9t9e81  8467
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