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Theorem 1p2e3 8854
Description: 1 + 2 = 3 (common case). (Contributed by David A. Wheeler, 8-Dec-2018.)
Assertion
Ref Expression
1p2e3  |-  ( 1  +  2 )  =  3

Proof of Theorem 1p2e3
StepHypRef Expression
1 2cn 8791 . 2  |-  2  e.  CC
2 ax-1cn 7713 . 2  |-  1  e.  CC
3 2p1e3 8853 . 2  |-  ( 2  +  1 )  =  3
41, 2, 3addcomli 7907 1  |-  ( 1  +  2 )  =  3
Colors of variables: wff set class
Syntax hints:    = wceq 1331  (class class class)co 5774   1c1 7621    + caddc 7623   2c2 8771   3c3 8772
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 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-11 1484  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-resscn 7712  ax-1cn 7713  ax-1re 7714  ax-addrcl 7717  ax-addcom 7720
This theorem depends on definitions:  df-bi 116  df-nf 1437  df-sb 1736  df-clab 2126  df-cleq 2132  df-clel 2135  df-in 3077  df-ss 3084  df-2 8779  df-3 8780
This theorem is referenced by:  binom3  10409  3lcm2e6woprm  11767  1kp2ke3k  12936
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