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Definition df-9 9811
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 9802 . 2  class  9
2 c8 9801 . . 3  class  8
3 c1 8738 . . 3  class  1
4 caddc 8740 . . 3  class  +
52, 3, 4co 5858 . 2  class  ( 8  +  1 )
61, 5wceq 1623 1  wff  9  =  ( 8  +  1 )
Colors of variables: wff set class
This definition is referenced by:  9re  9825  9pos  9837  8p1e9  9853  5p4e9  9862  6p3e9  9865  7p2e9  9867  8p2e10  9869  9nn  9884  8lt9  9914  9p9e18  10193  9t9e81  10226  19prm  13119  139prm  13125  log2tlbnd  20241  bposlem8  20530  lgsdir2lem5  20566  rmydioph  27107
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