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Definition df-9 10057
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 10048 . 2  class  9
2 c8 10047 . . 3  class  8
3 c1 8983 . . 3  class  1
4 caddc 8985 . . 3  class  +
52, 3, 4co 6073 . 2  class  ( 8  +  1 )
61, 5wceq 1652 1  wff  9  =  ( 8  +  1 )
Colors of variables: wff set class
This definition is referenced by:  9re  10071  9pos  10083  8p1e9  10101  5p4e9  10110  6p3e9  10113  7p2e9  10115  8p2e10  10117  9nn  10132  8lt9  10162  9p9e18  10443  9t9e81  10476  19prm  13432  139prm  13438  log2tlbnd  20777  bposlem8  21067  lgsdir2lem5  21103  rmydioph  27066
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