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Theorem 2p1e3 8982
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 8909 . 2  |-  3  =  ( 2  +  1 )
21eqcomi 2168 1  |-  ( 2  +  1 )  =  3
Colors of variables: wff set class
Syntax hints:    = wceq 1342  (class class class)co 5837   1c1 7746    + caddc 7748   2c2 8900   3c3 8901
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 1434  ax-gen 1436  ax-ext 2146
This theorem depends on definitions:  df-bi 116  df-cleq 2157  df-3 8909
This theorem is referenced by:  1p2e3  8983  cnm2m1cnm3  9100  6t5e30  9420  7t5e35  9425  8t4e32  9430  9t4e36  9437  decbin3  9455  halfthird  9456  fz0to3un2pr  10049  m1modge3gt1  10297  fac3  10635  hash3  10716  nn0o1gt2  11831  flodddiv4  11860
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