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Theorem 3p1e4 8809
Description: 3 + 1 = 4. (Contributed by Mario Carneiro, 18-Apr-2015.)
Assertion
Ref Expression
3p1e4 (3 + 1) = 4

Proof of Theorem 3p1e4
StepHypRef Expression
1 df-4 8741 . 2 4 = (3 + 1)
21eqcomi 2119 1 (3 + 1) = 4
Colors of variables: wff set class
Syntax hints:   = wceq 1314  (class class class)co 5740  1c1 7585   + caddc 7587  3c3 8732  4c4 8733
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 1406  ax-gen 1408  ax-ext 2097
This theorem depends on definitions:  df-bi 116  df-cleq 2108  df-4 8741
This theorem is referenced by:  7t6e42  9248  8t5e40  9253  9t5e45  9260  fac4  10430  4bc3eq4  10470  hash4  10511
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