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Theorem 9cn 9123
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 9122 . 2 9 ∈ ℝ
21recni 8083 1 9 ∈ ℂ
Colors of variables: wff set class
Syntax hints:  wcel 2175  cc 7922  9c9 9093
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 1469  ax-7 1470  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-8 1526  ax-11 1528  ax-4 1532  ax-17 1548  ax-i9 1552  ax-ial 1556  ax-i5r 1557  ax-ext 2186  ax-resscn 8016  ax-1re 8018  ax-addrcl 8021
This theorem depends on definitions:  df-bi 117  df-nf 1483  df-sb 1785  df-clab 2191  df-cleq 2197  df-clel 2200  df-in 3171  df-ss 3178  df-2 9094  df-3 9095  df-4 9096  df-5 9097  df-6 9098  df-7 9099  df-8 9100  df-9 9101
This theorem is referenced by:  10m1e9  9598  9t2e18  9624  9t8e72  9630  9t9e81  9631  9t11e99  9632  0.999...  11774  cos2bnd  12013  3dvds  12117  3dvdsdec  12118  3dvds2dec  12119  2exp8  12700
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