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Theorem 3p1e4 7823
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 7755 . 2  4  3  +  1
21eqcomi 2041 1  3  +  1  4
Colors of variables: wff set class
Syntax hints:   wceq 1242  (class class class)co 5455   1c1 6712    + caddc 6714   3c3 7745   4c4 7746
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-4 7755
This theorem is referenced by:  7t6e42  8229  8t5e40  8234  9t5e45  8241
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