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Theorem 9cn 9209
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 9208 . 2 9 ∈ ℝ
21recni 8169 1 9 ∈ ℂ
Colors of variables: wff set class
Syntax hints:  wcel 2200  cc 8008  9c9 9179
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 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-11 1552  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211  ax-resscn 8102  ax-1re 8104  ax-addrcl 8107
This theorem depends on definitions:  df-bi 117  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-in 3203  df-ss 3210  df-2 9180  df-3 9181  df-4 9182  df-5 9183  df-6 9184  df-7 9185  df-8 9186  df-9 9187
This theorem is referenced by:  10m1e9  9684  9t2e18  9710  9t8e72  9716  9t9e81  9717  9t11e99  9718  0.999...  12047  cos2bnd  12286  3dvds  12390  3dvdsdec  12391  3dvds2dec  12392  2exp8  12973
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