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Theorem 9cn 8832
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 8831 . 2 9 ∈ ℝ
21recni 7802 1 9 ∈ ℂ
Colors of variables: wff set class
Syntax hints:  wcel 1481  cc 7642  9c9 8802
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-11 1485  ax-4 1488  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-resscn 7736  ax-1re 7738  ax-addrcl 7741
This theorem depends on definitions:  df-bi 116  df-nf 1438  df-sb 1737  df-clab 2127  df-cleq 2133  df-clel 2136  df-in 3082  df-ss 3089  df-2 8803  df-3 8804  df-4 8805  df-5 8806  df-6 8807  df-7 8808  df-8 8809  df-9 8810
This theorem is referenced by:  10m1e9  9301  9t2e18  9327  9t8e72  9333  9t9e81  9334  9t11e99  9335  0.999...  11322  cos2bnd  11503  3dvdsdec  11598  3dvds2dec  11599
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