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Theorem 6p1e7 7826
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 7758 . 2  7  6  +  1
21eqcomi 2041 1  6  +  1  7
Colors of variables: wff set class
Syntax hints:   wceq 1242  (class class class)co 5455   1c1 6712    + caddc 6714   6c6 7748   7c7 7749
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-7 7758
This theorem is referenced by:  9t8e72  8244
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