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Theorem 7p1e8 9089
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 9015 . 2  |-  8  =  ( 7  +  1 )
21eqcomi 2193 1  |-  ( 7  +  1 )  =  8
Colors of variables: wff set class
Syntax hints:    = wceq 1364  (class class class)co 5897   1c1 7843    + caddc 7845   7c7 9006   8c8 9007
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1458  ax-gen 1460  ax-ext 2171
This theorem depends on definitions:  df-bi 117  df-cleq 2182  df-8 9015
This theorem is referenced by:  7t4e28  9525  9t9e81  9543
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