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Theorem 8p1e9 8526
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 8459 . 2  |-  9  =  ( 8  +  1 )
21eqcomi 2092 1  |-  ( 8  +  1 )  =  9
Colors of variables: wff set class
Syntax hints:    = wceq 1289  (class class class)co 5634   1c1 7330    + caddc 7332   8c8 8450   9c9 8451
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1381  ax-gen 1383  ax-ext 2070
This theorem depends on definitions:  df-bi 115  df-cleq 2081  df-9 8459
This theorem is referenced by: (None)
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