Theorem 9cn 9221

Description: The number 9 is complex. (Contributed by David A. Wheeler, 8-Dec-2018.)

Assertion

Ref	Expression
9cn	⊢ 9 ∈ ℂ

Proof of Theorem 9cn

Step	Hyp	Ref	Expression
1		9re 9220	. 2 ⊢ 9 ∈ ℝ
2	1	recni 8181	1 ⊢ 9 ∈ ℂ

Syntax hints:   ∈ wcel 2200  ℂcc 8020  9c9 9191

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 8114  ax-1re 8116  ax-addrcl 8119

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 3204  df-ss 3211  df-2 9192  df-3 9193  df-4 9194  df-5 9195  df-6 9196  df-7 9197  df-8 9198  df-9 9199

This theorem is referenced by:  10m1e9  9696  9t2e18  9722  9t8e72  9728  9t9e81  9729  9t11e99  9730  0.999...  12072  cos2bnd  12311  3dvds  12415  3dvdsdec  12416  3dvds2dec  12417  2exp8  12998