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Theorem 7p1e8 8810
Description: 7 + 1 = 8. (Contributed by Mario Carneiro, 18-Apr-2015.)
Assertion
Ref Expression
7p1e8 (7 + 1) = 8

Proof of Theorem 7p1e8
StepHypRef Expression
1 df-8 8742 . 2 8 = (7 + 1)
21eqcomi 2119 1 (7 + 1) = 8
Colors of variables: wff set class
Syntax hints:   = wceq 1314  (class class class)co 5740  1c1 7585   + caddc 7587  7c7 8733  8c8 8734
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1406  ax-gen 1408  ax-ext 2097
This theorem depends on definitions:  df-bi 116  df-cleq 2108  df-8 8742
This theorem is referenced by:  7t4e28  9243  9t9e81  9261
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