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Theorem 8p1e9 8239
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 8172 . 2  |-  9  =  ( 8  +  1 )
21eqcomi 2086 1  |-  ( 8  +  1 )  =  9
Colors of variables: wff set class
Syntax hints:    = wceq 1285  (class class class)co 5543   1c1 7044    + caddc 7046   8c8 8162   9c9 8163
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 1377  ax-gen 1379  ax-ext 2064
This theorem depends on definitions:  df-bi 115  df-cleq 2075  df-9 8172
This theorem is referenced by: (None)
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