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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 9400 | . 2 ⊢ 9 ∈ ℝ | |
| 2 | 1 | recni 8344 | 1 ⊢ 9 ∈ ℂ |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ∈ wcel 2209 ℂcc 8183 9c9 9371 |
| This proof depends on 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 8277 ax-1re 8279 ax-addrcl 8282 |
| This proof 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 9372 df-3 9373 df-4 9374 df-5 9375 df-6 9376 df-7 9377 df-8 9378 df-9 9379 |
| This theorem is used by: 10m1e9 9888 9t2e18 9914 9t8e72 9920 9t9e81 9921 9t11e99 9922 0.999... 12313 cos2bnd 12552 3dvds 12656 3dvdsdec 12657 3dvds2dec 12658 2exp8 13244 139prm 13267 163prm 13268 317prm 13269 631prm 13270 1259lem1 13271 1259lem2 13272 1259lem3 13273 1259lem4 13274 1259lem5 13275 log2tlbndlog2 16220 log2ublem3 16223 log2ublog2 16224 bposlem8 16318 |
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