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| Mirrors > Home > ILE Home > Th. List > 9cn | GIF version | ||
| Description: The number 9 is complex. (Contributed by David A. Wheeler, 8-Dec-2018.) |
| Ref | Expression |
|---|---|
| 9cn | ⊢ 9 ∈ ℂ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 9re 9096 | . 2 ⊢ 9 ∈ ℝ | |
| 2 | 1 | recni 8057 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2167 ℂcc 7896 9c9 9067 |
| 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 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-11 1520 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-ext 2178 ax-resscn 7990 ax-1re 7992 ax-addrcl 7995 |
| This theorem depends on definitions: df-bi 117 df-nf 1475 df-sb 1777 df-clab 2183 df-cleq 2189 df-clel 2192 df-in 3163 df-ss 3170 df-2 9068 df-3 9069 df-4 9070 df-5 9071 df-6 9072 df-7 9073 df-8 9074 df-9 9075 |
| This theorem is referenced by: 10m1e9 9571 9t2e18 9597 9t8e72 9603 9t9e81 9604 9t11e99 9605 0.999... 11705 cos2bnd 11944 3dvds 12048 3dvdsdec 12049 3dvds2dec 12050 2exp8 12631 |
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