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Theorem 3p1e4 8541
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 8473 . 2 4 = (3 + 1)
21eqcomi 2092 1 (3 + 1) = 4
Colors of variables: wff set class
Syntax hints:   = wceq 1289  (class class class)co 5644  1c1 7341   + caddc 7343  3c3 8464  4c4 8465
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1381  ax-gen 1383  ax-ext 2070
This theorem depends on definitions:  df-bi 115  df-cleq 2081  df-4 8473
This theorem is referenced by:  7t6e42  8979  8t5e40  8984  9t5e45  8991  fac4  10129  4bc3eq4  10169  hash4  10210
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