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Theorem 6p1e7 9009
Description: 6 + 1 = 7. (Contributed by Mario Carneiro, 18-Apr-2015.)
Assertion
Ref Expression
6p1e7 (6 + 1) = 7

Proof of Theorem 6p1e7
StepHypRef Expression
1 df-7 8935 . 2 7 = (6 + 1)
21eqcomi 2174 1 (6 + 1) = 7
Colors of variables: wff set class
Syntax hints:   = wceq 1348  (class class class)co 5851  1c1 7768   + caddc 7770  6c6 8926  7c7 8927
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 1440  ax-gen 1442  ax-ext 2152
This theorem depends on definitions:  df-bi 116  df-cleq 2163  df-7 8935
This theorem is referenced by:  9t8e72  9463
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