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Theorem 1p2e3 9418
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 9354 . 2 2 ∈ ℂ
2 ax-1cn 8262 . 2 1 ∈ ℂ
3 2p1e3 9417 . 2 (2 + 1) = 3
41, 2, 3addcomli 8461 1 (1 + 2) = 3
Colors of variables: wff set class
Syntax hints:   = wceq 1402  (class class class)co 6075  1c1 8170   + caddc 8172  2c2 9334  3c3 9335
This theorem was proved from 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 8261  ax-1cn 8262  ax-1re 8263  ax-addrcl 8266  ax-addcom 8269
This theorem 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 9342  df-3 9343
This theorem is referenced by:  binom3  11072  3lcm2e6woprm  12842  2exp16  13194  1kp2ke3k  16652
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