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Definition df-9 8459
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 8451 . 2 class 9
2 c8 8450 . . 3 class 8
3 c1 7330 . . 3 class 1
4 caddc 7332 . . 3 class +
52, 3, 4co 5634 . 2 class (8 + 1)
61, 5wceq 1289 1 wff 9 = (8 + 1)
Colors of variables: wff set class
This definition is referenced by:  9re  8480  9pos  8497  8p1e9  8526  5p4e9  8534  6p3e9  8536  7p2e9  8537  9nn  8554  8lt9  8583  8p2e10  8925  9p9e18  8939  9t9e81  8974
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