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Definition df-9 10070
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 10061 . 2  class  9
2 c8 10060 . . 3  class  8
3 c1 8996 . . 3  class  1
4 caddc 8998 . . 3  class  +
52, 3, 4co 6084 . 2  class  ( 8  +  1 )
61, 5wceq 1653 1  wff  9  =  ( 8  +  1 )
Colors of variables: wff set class
This definition is referenced by:  9re  10084  9pos  10096  8p1e9  10114  5p4e9  10123  6p3e9  10126  7p2e9  10128  8p2e10  10130  9nn  10145  8lt9  10175  9p9e18  10456  9t9e81  10489  19prm  13445  139prm  13451  log2tlbnd  20790  bposlem8  21080  lgsdir2lem5  21116  rmydioph  27098
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