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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 8667 | . . 3 ⊢ i ≠ 0 | |
| 2 | 1 | neii 2414 | . 2 ⊢ ¬ i = 0 |
| 3 | 0lt1 8400 | . . . . . 6 ⊢ 0 < 1 | |
| 4 | 0re 8274 | . . . . . . 7 ⊢ 0 ∈ ℝ | |
| 5 | 1re 8273 | . . . . . . 7 ⊢ 1 ∈ ℝ | |
| 6 | 4, 5 | ltnsymi 8373 | . . . . . 6 ⊢ (0 < 1 → ¬ 1 < 0) |
| 7 | 3, 6 | ax-mp 5 | . . . . 5 ⊢ ¬ 1 < 0 |
| 8 | ixi 8857 | . . . . . . . 8 ⊢ (i · i) = -1 | |
| 9 | 5 | renegcli 8535 | . . . . . . . 8 ⊢ -1 ∈ ℝ |
| 10 | 8, 9 | eqeltri 2305 | . . . . . . 7 ⊢ (i · i) ∈ ℝ |
| 11 | 4, 10, 5 | ltadd1i 8776 | . . . . . 6 ⊢ (0 < (i · i) ↔ (0 + 1) < ((i · i) + 1)) |
| 12 | ax-1cn 8220 | . . . . . . . 8 ⊢ 1 ∈ ℂ | |
| 13 | 12 | addlidi 8416 | . . . . . . 7 ⊢ (0 + 1) = 1 |
| 14 | ax-i2m1 8232 | . . . . . . 7 ⊢ ((i · i) + 1) = 0 | |
| 15 | 13, 14 | breq12i 4118 | . . . . . 6 ⊢ ((0 + 1) < ((i · i) + 1) ↔ 1 < 0) |
| 16 | 11, 15 | bitri 184 | . . . . 5 ⊢ (0 < (i · i) ↔ 1 < 0) |
| 17 | 7, 16 | mtbir 678 | . . . 4 ⊢ ¬ 0 < (i · i) |
| 18 | mullt0 8754 | . . . . . 6 ⊢ (((i ∈ ℝ ∧ i < 0) ∧ (i ∈ ℝ ∧ i < 0)) → 0 < (i · i)) | |
| 19 | 18 | anidms 397 | . . . . 5 ⊢ ((i ∈ ℝ ∧ i < 0) → 0 < (i · i)) |
| 20 | 19 | ex 115 | . . . 4 ⊢ (i ∈ ℝ → (i < 0 → 0 < (i · i))) |
| 21 | 17, 20 | mtoi 670 | . . 3 ⊢ (i ∈ ℝ → ¬ i < 0) |
| 22 | mulgt0 8348 | . . . . . 6 ⊢ (((i ∈ ℝ ∧ 0 < i) ∧ (i ∈ ℝ ∧ 0 < i)) → 0 < (i · i)) | |
| 23 | 22 | anidms 397 | . . . . 5 ⊢ ((i ∈ ℝ ∧ 0 < i) → 0 < (i · i)) |
| 24 | 23 | ex 115 | . . . 4 ⊢ (i ∈ ℝ → (0 < i → 0 < (i · i))) |
| 25 | 17, 24 | mtoi 670 | . . 3 ⊢ (i ∈ ℝ → ¬ 0 < i) |
| 26 | lttri3 8353 | . . . 4 ⊢ ((i ∈ ℝ ∧ 0 ∈ ℝ) → (i = 0 ↔ (¬ i < 0 ∧ ¬ 0 < i))) | |
| 27 | 4, 26 | mpan2 425 | . . 3 ⊢ (i ∈ ℝ → (i = 0 ↔ (¬ i < 0 ∧ ¬ 0 < i))) |
| 28 | 21, 25, 27 | mpbir2and 953 | . 2 ⊢ (i ∈ ℝ → i = 0) |
| 29 | 2, 28 | mto 668 | 1 ⊢ ¬ i ∈ ℝ |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 ∧ wa 104 ↔ wb 105 = wceq 1398 ∈ wcel 2203 class class class wbr 4109 (class class class)co 6050 ℝcr 8126 0cc0 8127 1c1 8128 ici 8129 + caddc 8130 · cmul 8132 < clt 8308 -cneg 8445 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-sep 4228 ax-pow 4287 ax-pr 4322 ax-un 4554 ax-setind 4659 ax-cnex 8218 ax-resscn 8219 ax-1cn 8220 ax-1re 8221 ax-icn 8222 ax-addcl 8223 ax-addrcl 8224 ax-mulcl 8225 ax-mulrcl 8226 ax-addcom 8227 ax-mulcom 8228 ax-addass 8229 ax-distr 8231 ax-i2m1 8232 ax-0lt1 8233 ax-0id 8235 ax-rnegex 8236 ax-cnre 8238 ax-pre-ltirr 8239 ax-pre-lttrn 8241 ax-pre-apti 8242 ax-pre-ltadd 8243 ax-pre-mulgt0 8244 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ne 2413 df-nel 2508 df-ral 2525 df-rex 2526 df-reu 2527 df-rab 2529 df-v 2815 df-sbc 3043 df-dif 3213 df-un 3215 df-in 3217 df-ss 3224 df-pw 3671 df-sn 3695 df-pr 3696 df-op 3698 df-uni 3915 df-br 4110 df-opab 4172 df-id 4414 df-xp 4755 df-rel 4756 df-cnv 4757 df-co 4758 df-dm 4759 df-iota 5312 df-fun 5354 df-fv 5360 df-riota 6003 df-ov 6053 df-oprab 6054 df-mpo 6055 df-pnf 8310 df-mnf 8311 df-ltxr 8313 df-sub 8446 df-neg 8447 |
| This theorem is referenced by: rimul 8859 |
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