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Theorem 8p1e9 10655
Description: 8 + 1 = 9. (Contributed by Mario Carneiro, 18-Apr-2015.)
Assertion
Ref Expression
8p1e9  |-  ( 8  +  1 )  =  9

Proof of Theorem 8p1e9
StepHypRef Expression
1 df-9 10590 . 2  |-  9  =  ( 8  +  1 )
21eqcomi 2473 1  |-  ( 8  +  1 )  =  9
Colors of variables: wff setvar class
Syntax hints:    = wceq 1374  (class class class)co 6275   1c1 9482    + caddc 9484   8c8 10580   9c9 10581
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1596  ax-4 1607  ax-ext 2438
This theorem depends on definitions:  df-bi 185  df-cleq 2452  df-9 10590
This theorem is referenced by:  cos2bnd  13773  19prm  14450  139prm  14456  317prm  14458  1259lem2  14461  1259lem4  14463  1259lem5  14464  1259prm  14465  2503lem1  14466  2503lem2  14467  2503lem3  14468  4001lem1  14470  quartlem1  22909  log2ub  23001
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