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Theorem 4p1e5 7824
Description: 4 + 1 = 5. (Contributed by Mario Carneiro, 18-Apr-2015.)
Assertion
Ref Expression
4p1e5  4  +  1  5

Proof of Theorem 4p1e5
StepHypRef Expression
1 df-5 7756 . 2  5  4  +  1
21eqcomi 2041 1  4  +  1  5
Colors of variables: wff set class
Syntax hints:   wceq 1242  (class class class)co 5455   1c1 6712    + caddc 6714   4c4 7746   5c5 7747
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-5 7756
This theorem is referenced by:  8t7e56  8236  9t6e54  8242
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