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Theorem 1p2e3 9142
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 9078 . 2 2 ∈ ℂ
2 ax-1cn 7989 . 2 1 ∈ ℂ
3 2p1e3 9141 . 2 (2 + 1) = 3
41, 2, 3addcomli 8188 1 (1 + 2) = 3
Colors of variables: wff set class
Syntax hints:   = wceq 1364  (class class class)co 5925  1c1 7897   + caddc 7899  2c2 9058  3c3 9059
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 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-11 1520  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178  ax-resscn 7988  ax-1cn 7989  ax-1re 7990  ax-addrcl 7993  ax-addcom 7996
This theorem depends on definitions:  df-bi 117  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-in 3163  df-ss 3170  df-2 9066  df-3 9067
This theorem is referenced by:  binom3  10766  3lcm2e6woprm  12279  2exp16  12631  1kp2ke3k  15454
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