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Theorem 1p2e3 9439
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 9375 . 2  |-  2  e.  CC
2 ax-1cn 8272 . 2  |-  1  e.  CC
3 2p1e3 9438 . 2  |-  ( 2  +  1 )  =  3
41, 2, 3addcomli 8471 1  |-  ( 1  +  2 )  =  3
Colors of variables:    wff set class
This proof depends on syntax axioms:    = wceq 1402  (class class class)co 6085   1c1 8180    + caddc 8182   2c2 9355   3c3 9356
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-11 1559  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220  ax-resscn 8271  ax-1cn 8272  ax-1re 8273  ax-addrcl 8276  ax-addcom 8279
This proof depends on definitions:  df-bi 117  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-in 3226  df-ss 3233  df-2 9363  df-3 9364
This theorem is used by:  binom3  11094  3lcm2e6woprm  12864  2exp16  13216  log2ublem3  16085  log2ublog2  16086  1kp2ke3k  16738
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