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Theorem 8p1e9 9089
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 9015 . 2  |-  9  =  ( 8  +  1 )
21eqcomi 2193 1  |-  ( 8  +  1 )  =  9
Colors of variables: wff set class
Syntax hints:    = wceq 1364  (class class class)co 5896   1c1 7842    + caddc 7844   8c8 9006   9c9 9007
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1458  ax-gen 1460  ax-ext 2171
This theorem depends on definitions:  df-bi 117  df-cleq 2182  df-9 9015
This theorem is referenced by:  cos2bnd  11800
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