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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 9370 | . 2 ⊢ 9 ∈ ℝ | |
| 2 | 1 | recni 8328 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2209 ℂcc 8167 9c9 9341 |
| 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 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-11 1559 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 ax-resscn 8261 ax-1re 8263 ax-addrcl 8266 |
| This theorem depends on definitions: df-bi 117 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-in 3226 df-ss 3233 df-2 9342 df-3 9343 df-4 9344 df-5 9345 df-6 9346 df-7 9347 df-8 9348 df-9 9349 |
| This theorem is referenced by: 10m1e9 9851 9t2e18 9877 9t8e72 9883 9t9e81 9884 9t11e99 9885 0.999... 12266 cos2bnd 12505 3dvds 12609 3dvdsdec 12610 3dvds2dec 12611 2exp8 13192 |
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