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Theorem 1p2e3 8878
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 8815 . 2 2 ∈ ℂ
2 ax-1cn 7737 . 2 1 ∈ ℂ
3 2p1e3 8877 . 2 (2 + 1) = 3
41, 2, 3addcomli 7931 1 (1 + 2) = 3
Colors of variables: wff set class
Syntax hints:   = wceq 1332  (class class class)co 5782  1c1 7645   + caddc 7647  2c2 8795  3c3 8796
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 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-11 1485  ax-4 1488  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-resscn 7736  ax-1cn 7737  ax-1re 7738  ax-addrcl 7741  ax-addcom 7744
This theorem depends on definitions:  df-bi 116  df-nf 1438  df-sb 1737  df-clab 2127  df-cleq 2133  df-clel 2136  df-in 3082  df-ss 3089  df-2 8803  df-3 8804
This theorem is referenced by:  binom3  10440  3lcm2e6woprm  11803  1kp2ke3k  13107
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