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Theorem 3p1e4 8286
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 8219 . 2  |-  4  =  ( 3  +  1 )
21eqcomi 2087 1  |-  ( 3  +  1 )  =  4
Colors of variables: wff set class
Syntax hints:    = wceq 1285  (class class class)co 5563   1c1 7096    + caddc 7098   3c3 8209   4c4 8210
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 1377  ax-gen 1379  ax-ext 2065
This theorem depends on definitions:  df-bi 115  df-cleq 2076  df-4 8219
This theorem is referenced by:  7t6e42  8722  8t5e40  8727  9t5e45  8734  fac4  9809  4bc3eq4  9849  hash4  9890
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