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Theorem 4cn 7993
 Description: The number 4 is a complex number. (Contributed by David A. Wheeler, 7-Jul-2016.)
Assertion
Ref Expression
4cn

Proof of Theorem 4cn
StepHypRef Expression
1 4re 7992 . 2
21recni 7039 1
 Colors of variables: wff set class Syntax hints:   wcel 1393  cc 6887  c4 7966 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-11 1397  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-resscn 6976  ax-1re 6978  ax-addrcl 6981 This theorem depends on definitions:  df-bi 110  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-in 2924  df-ss 2931  df-2 7973  df-3 7974  df-4 7975 This theorem is referenced by:  4p2e6  8054  4p3e7  8055  4p4e8  8056  5p5e10  8060  4t2e8  8073  4d2e2  8076  8th4div3  8144  div4p1lem1div2  8177  4t4e16  8440  fzo0to42pr  9076  fldiv4p1lem1div2  9147  resqrexlemover  9608  resqrexlemcalc1  9612  resqrexlemcalc3  9614
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