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Theorem 8p1e9 7828
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 7760 . 2  9  8  +  1
21eqcomi 2041 1  8  +  1  9
Colors of variables: wff set class
Syntax hints:   wceq 1242  (class class class)co 5455   1c1 6712    + caddc 6714   8c8 7750   9c9 7751
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-5 1333  ax-gen 1335  ax-ext 2019
This theorem depends on definitions:  df-bi 110  df-cleq 2030  df-9 7760
This theorem is referenced by: (None)
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