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Theorem 8p1e9 8050
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 7980 . 2 9 = (8 + 1)
21eqcomi 2044 1 (8 + 1) = 9
Colors of variables: wff set class
Syntax hints:   = wceq 1243  (class class class)co 5512  1c1 6890   + caddc 6892  8c8 7970  9c9 7971
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 1336  ax-gen 1338  ax-ext 2022
This theorem depends on definitions:  df-bi 110  df-cleq 2033  df-9 7980
This theorem is referenced by: (None)
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