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Theorem 9cn 9002
Description: The number 9 is complex. (Contributed by David A. Wheeler, 8-Dec-2018.)
Assertion
Ref Expression
9cn 9 ∈ ℂ

Proof of Theorem 9cn
StepHypRef Expression
1 9re 9001 . 2 9 ∈ ℝ
21recni 7965 1 9 ∈ ℂ
Colors of variables: wff set class
Syntax hints:  wcel 2148  cc 7805  9c9 8972
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 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-11 1506  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-ext 2159  ax-resscn 7899  ax-1re 7901  ax-addrcl 7904
This theorem depends on definitions:  df-bi 117  df-nf 1461  df-sb 1763  df-clab 2164  df-cleq 2170  df-clel 2173  df-in 3135  df-ss 3142  df-2 8973  df-3 8974  df-4 8975  df-5 8976  df-6 8977  df-7 8978  df-8 8979  df-9 8980
This theorem is referenced by:  10m1e9  9474  9t2e18  9500  9t8e72  9506  9t9e81  9507  9t11e99  9508  0.999...  11521  cos2bnd  11760  3dvdsdec  11861  3dvds2dec  11862
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