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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 9153 | . 2 ⊢ 9 ∈ ℝ | |
| 2 | 1 | recni 8114 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2177 ℂcc 7953 9c9 9124 |
| 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 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-11 1530 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-ext 2188 ax-resscn 8047 ax-1re 8049 ax-addrcl 8052 |
| This theorem depends on definitions: df-bi 117 df-nf 1485 df-sb 1787 df-clab 2193 df-cleq 2199 df-clel 2202 df-in 3176 df-ss 3183 df-2 9125 df-3 9126 df-4 9127 df-5 9128 df-6 9129 df-7 9130 df-8 9131 df-9 9132 |
| This theorem is referenced by: 10m1e9 9629 9t2e18 9655 9t8e72 9661 9t9e81 9662 9t11e99 9663 0.999... 11917 cos2bnd 12156 3dvds 12260 3dvdsdec 12261 3dvds2dec 12262 2exp8 12843 |
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