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Theorem 3p1e4 8118
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 8051 . 2 4 = (3 + 1)
21eqcomi 2060 1 (3 + 1) = 4
Colors of variables: wff set class
Syntax hints:   = wceq 1259  (class class class)co 5540  1c1 6948   + caddc 6950  3c3 8041  4c4 8042
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 103  ax-ia2 104  ax-ia3 105  ax-5 1352  ax-gen 1354  ax-ext 2038
This theorem depends on definitions:  df-bi 114  df-cleq 2049  df-4 8051
This theorem is referenced by:  7t6e42  8539  8t5e40  8544  9t5e45  8551  fac4  9601  4bc3eq4  9641
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