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Theorem 1p2e3 9372
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 9308 . 2 2 ∈ ℂ
2 ax-1cn 8220 . 2 1 ∈ ℂ
3 2p1e3 9371 . 2 (2 + 1) = 3
41, 2, 3addcomli 8418 1 (1 + 2) = 3
Colors of variables: wff set class
Syntax hints:   = wceq 1398  (class class class)co 6050  1c1 8128   + caddc 8130  2c2 9288  3c3 9289
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 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-11 1555  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2214  ax-resscn 8219  ax-1cn 8220  ax-1re 8221  ax-addrcl 8224  ax-addcom 8227
This theorem depends on definitions:  df-bi 117  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-in 3217  df-ss 3224  df-2 9296  df-3 9297
This theorem is referenced by:  binom3  11019  3lcm2e6woprm  12783  2exp16  13135  1kp2ke3k  16492
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