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Theorem 7p1e8 8827
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 8753 . 2 8 = (7 + 1)
21eqcomi 2121 1 (7 + 1) = 8
Colors of variables: wff set class
Syntax hints:   = wceq 1316  (class class class)co 5742  1c1 7589   + caddc 7591  7c7 8744  8c8 8745
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 1408  ax-gen 1410  ax-ext 2099
This theorem depends on definitions:  df-bi 116  df-cleq 2110  df-8 8753
This theorem is referenced by:  7t4e28  9260  9t9e81  9278
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