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Theorem 9cn 9273
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 9272 . 2 9 ∈ ℝ
21recni 8234 1 9 ∈ ℂ
Colors of variables: wff set class
Syntax hints:  wcel 2202  cc 8073  9c9 9243
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 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-11 1555  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2213  ax-resscn 8167  ax-1re 8169  ax-addrcl 8172
This theorem depends on definitions:  df-bi 117  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-in 3207  df-ss 3214  df-2 9244  df-3 9245  df-4 9246  df-5 9247  df-6 9248  df-7 9249  df-8 9250  df-9 9251
This theorem is referenced by:  10m1e9  9750  9t2e18  9776  9t8e72  9782  9t9e81  9783  9t11e99  9784  0.999...  12145  cos2bnd  12384  3dvds  12488  3dvdsdec  12489  3dvds2dec  12490  2exp8  13071
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