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Theorem 8p1e9 8123
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 8056 . 2 9 = (8 + 1)
21eqcomi 2060 1 (8 + 1) = 9
Colors of variables: wff set class
Syntax hints:   = wceq 1259  (class class class)co 5540  1c1 6948   + caddc 6950  8c8 8046  9c9 8047
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 103  ax-ia2 104  ax-ia3 105  ax-5 1352  ax-gen 1354  ax-ext 2038
This theorem depends on definitions:  df-bi 114  df-cleq 2049  df-9 8056
This theorem is referenced by: (None)
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