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Theorem 2p1e3 9011
Description: 2 + 1 = 3. (Contributed by Mario Carneiro, 18-Apr-2015.)
Assertion
Ref Expression
2p1e3 (2 + 1) = 3

Proof of Theorem 2p1e3
StepHypRef Expression
1 df-3 8938 . 2 3 = (2 + 1)
21eqcomi 2174 1 (2 + 1) = 3
Colors of variables: wff set class
Syntax hints:   = wceq 1348  (class class class)co 5853  1c1 7775   + caddc 7777  2c2 8929  3c3 8930
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1440  ax-gen 1442  ax-ext 2152
This theorem depends on definitions:  df-bi 116  df-cleq 2163  df-3 8938
This theorem is referenced by:  1p2e3  9012  cnm2m1cnm3  9129  6t5e30  9449  7t5e35  9454  8t4e32  9459  9t4e36  9466  decbin3  9484  halfthird  9485  fz0to3un2pr  10079  m1modge3gt1  10327  fac3  10666  hash3  10748  nn0o1gt2  11864  flodddiv4  11893
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