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Theorem 9cn 9154
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 9153 . 2 9 ∈ ℝ
21recni 8114 1 9 ∈ ℂ
Colors of variables: wff set class
Syntax hints:  wcel 2177  cc 7953  9c9 9124
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 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-11 1530  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-ext 2188  ax-resscn 8047  ax-1re 8049  ax-addrcl 8052
This theorem depends on definitions:  df-bi 117  df-nf 1485  df-sb 1787  df-clab 2193  df-cleq 2199  df-clel 2202  df-in 3176  df-ss 3183  df-2 9125  df-3 9126  df-4 9127  df-5 9128  df-6 9129  df-7 9130  df-8 9131  df-9 9132
This theorem is referenced by:  10m1e9  9629  9t2e18  9655  9t8e72  9661  9t9e81  9662  9t11e99  9663  0.999...  11917  cos2bnd  12156  3dvds  12260  3dvdsdec  12261  3dvds2dec  12262  2exp8  12843
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