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| Mirrors > Home > ILE Home > Th. List > inelr | GIF version | ||
| Description: The imaginary unit i is not a real number. (Contributed by NM, 6-May-1999.) |
| Ref | Expression |
|---|---|
| inelr | ⊢ ¬ i ∈ ℝ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ine0 8711 | . . 3 ⊢ i ≠ 0 | |
| 2 | 1 | neii 2422 | . 2 ⊢ ¬ i = 0 |
| 3 | 0lt1 8443 | . . . . . 6 ⊢ 0 < 1 | |
| 4 | 0re 8316 | . . . . . . 7 ⊢ 0 ∈ ℝ | |
| 5 | 1re 8315 | . . . . . . 7 ⊢ 1 ∈ ℝ | |
| 6 | 4, 5 | ltnsymi 8415 | . . . . . 6 ⊢ (0 < 1 → ¬ 1 < 0) |
| 7 | 3, 6 | ax-mp 5 | . . . . 5 ⊢ ¬ 1 < 0 |
| 8 | ixi 8901 | . . . . . . . 8 ⊢ (i · i) = -1 | |
| 9 | 5 | renegcli 8578 | . . . . . . . 8 ⊢ -1 ∈ ℝ |
| 10 | 8, 9 | eqeltri 2311 | . . . . . . 7 ⊢ (i · i) ∈ ℝ |
| 11 | 4, 10, 5 | ltadd1i 8820 | . . . . . 6 ⊢ (0 < (i · i) ↔ (0 + 1) < ((i · i) + 1)) |
| 12 | ax-1cn 8262 | . . . . . . . 8 ⊢ 1 ∈ ℂ | |
| 13 | 12 | addlidi 8459 | . . . . . . 7 ⊢ (0 + 1) = 1 |
| 14 | ax-i2m1 8274 | . . . . . . 7 ⊢ ((i · i) + 1) = 0 | |
| 15 | 13, 14 | breq12i 4134 | . . . . . 6 ⊢ ((0 + 1) < ((i · i) + 1) ↔ 1 < 0) |
| 16 | 11, 15 | bitri 184 | . . . . 5 ⊢ (0 < (i · i) ↔ 1 < 0) |
| 17 | 7, 16 | mtbir 682 | . . . 4 ⊢ ¬ 0 < (i · i) |
| 18 | mullt0 8798 | . . . . . 6 ⊢ (((i ∈ ℝ ∧ i < 0) ∧ (i ∈ ℝ ∧ i < 0)) → 0 < (i · i)) | |
| 19 | 18 | anidms 401 | . . . . 5 ⊢ ((i ∈ ℝ ∧ i < 0) → 0 < (i · i)) |
| 20 | 19 | ex 115 | . . . 4 ⊢ (i ∈ ℝ → (i < 0 → 0 < (i · i))) |
| 21 | 17, 20 | mtoi 674 | . . 3 ⊢ (i ∈ ℝ → ¬ i < 0) |
| 22 | mulgt0 8390 | . . . . . 6 ⊢ (((i ∈ ℝ ∧ 0 < i) ∧ (i ∈ ℝ ∧ 0 < i)) → 0 < (i · i)) | |
| 23 | 22 | anidms 401 | . . . . 5 ⊢ ((i ∈ ℝ ∧ 0 < i) → 0 < (i · i)) |
| 24 | 23 | ex 115 | . . . 4 ⊢ (i ∈ ℝ → (0 < i → 0 < (i · i))) |
| 25 | 17, 24 | mtoi 674 | . . 3 ⊢ (i ∈ ℝ → ¬ 0 < i) |
| 26 | lttri3 8395 | . . . 4 ⊢ ((i ∈ ℝ ∧ 0 ∈ ℝ) → (i = 0 ↔ (¬ i < 0 ∧ ¬ 0 < i))) | |
| 27 | 4, 26 | mpan2 429 | . . 3 ⊢ (i ∈ ℝ → (i = 0 ↔ (¬ i < 0 ∧ ¬ 0 < i))) |
| 28 | 21, 25, 27 | mpbir2and 957 | . 2 ⊢ (i ∈ ℝ → i = 0) |
| 29 | 2, 28 | mto 672 | 1 ⊢ ¬ i ∈ ℝ |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 ∧ wa 104 ↔ wb 105 = wceq 1402 ∈ wcel 2209 class class class wbr 4125 (class class class)co 6075 ℝcr 8168 0cc0 8169 1c1 8170 ici 8171 + caddc 8172 · cmul 8174 < clt 8350 -cneg 8488 |
| 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-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4244 ax-pow 4306 ax-pr 4341 ax-un 4573 ax-setind 4679 ax-cnex 8260 ax-resscn 8261 ax-1cn 8262 ax-1re 8263 ax-icn 8264 ax-addcl 8265 ax-addrcl 8266 ax-mulcl 8267 ax-mulrcl 8268 ax-addcom 8269 ax-mulcom 8270 ax-addass 8271 ax-distr 8273 ax-i2m1 8274 ax-0lt1 8275 ax-0id 8277 ax-rnegex 8278 ax-cnre 8280 ax-pre-ltirr 8281 ax-pre-lttrn 8283 ax-pre-apti 8284 ax-pre-ltadd 8285 ax-pre-mulgt0 8286 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-br 4126 df-opab 4188 df-id 4433 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-iota 5332 df-fun 5374 df-fv 5380 df-riota 6028 df-ov 6078 df-oprab 6079 df-mpo 6080 df-pnf 8352 df-mnf 8353 df-ltxr 8355 df-sub 8489 df-neg 8490 |
| This theorem is referenced by: rimul 8903 |
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