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Theorem 7p1e8 7827
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 7759 . 2  8  7  +  1
21eqcomi 2041 1  7  +  1  8
Colors of variables: wff set class
Syntax hints:   wceq 1242  (class class class)co 5455   1c1 6712    + caddc 6714   7c7 7749   8c8 7750
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-8 7759
This theorem is referenced by:  7t4e28  8227  9t9e81  8245
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