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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 8563 | . . 3 ⊢ i ≠ 0 | |
| 2 | 1 | neii 2402 | . 2 ⊢ ¬ i = 0 |
| 3 | 0lt1 8296 | . . . . . 6 ⊢ 0 < 1 | |
| 4 | 0re 8169 | . . . . . . 7 ⊢ 0 ∈ ℝ | |
| 5 | 1re 8168 | . . . . . . 7 ⊢ 1 ∈ ℝ | |
| 6 | 4, 5 | ltnsymi 8269 | . . . . . 6 ⊢ (0 < 1 → ¬ 1 < 0) |
| 7 | 3, 6 | ax-mp 5 | . . . . 5 ⊢ ¬ 1 < 0 |
| 8 | ixi 8753 | . . . . . . . 8 ⊢ (i · i) = -1 | |
| 9 | 5 | renegcli 8431 | . . . . . . . 8 ⊢ -1 ∈ ℝ |
| 10 | 8, 9 | eqeltri 2302 | . . . . . . 7 ⊢ (i · i) ∈ ℝ |
| 11 | 4, 10, 5 | ltadd1i 8672 | . . . . . 6 ⊢ (0 < (i · i) ↔ (0 + 1) < ((i · i) + 1)) |
| 12 | ax-1cn 8115 | . . . . . . . 8 ⊢ 1 ∈ ℂ | |
| 13 | 12 | addlidi 8312 | . . . . . . 7 ⊢ (0 + 1) = 1 |
| 14 | ax-i2m1 8127 | . . . . . . 7 ⊢ ((i · i) + 1) = 0 | |
| 15 | 13, 14 | breq12i 4095 | . . . . . 6 ⊢ ((0 + 1) < ((i · i) + 1) ↔ 1 < 0) |
| 16 | 11, 15 | bitri 184 | . . . . 5 ⊢ (0 < (i · i) ↔ 1 < 0) |
| 17 | 7, 16 | mtbir 675 | . . . 4 ⊢ ¬ 0 < (i · i) |
| 18 | mullt0 8650 | . . . . . 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 668 | . . 3 ⊢ (i ∈ ℝ → ¬ i < 0) |
| 22 | mulgt0 8244 | . . . . . 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 668 | . . 3 ⊢ (i ∈ ℝ → ¬ 0 < i) |
| 26 | lttri3 8249 | . . . 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 950 | . 2 ⊢ (i ∈ ℝ → i = 0) |
| 29 | 2, 28 | mto 666 | 1 ⊢ ¬ i ∈ ℝ |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 ∧ wa 104 ↔ wb 105 = wceq 1395 ∈ wcel 2200 class class class wbr 4086 (class class class)co 6013 ℝcr 8021 0cc0 8022 1c1 8023 ici 8024 + caddc 8025 · cmul 8027 < clt 8204 -cneg 8341 |
| 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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4205 ax-pow 4262 ax-pr 4297 ax-un 4528 ax-setind 4633 ax-cnex 8113 ax-resscn 8114 ax-1cn 8115 ax-1re 8116 ax-icn 8117 ax-addcl 8118 ax-addrcl 8119 ax-mulcl 8120 ax-mulrcl 8121 ax-addcom 8122 ax-mulcom 8123 ax-addass 8124 ax-distr 8126 ax-i2m1 8127 ax-0lt1 8128 ax-0id 8130 ax-rnegex 8131 ax-cnre 8133 ax-pre-ltirr 8134 ax-pre-lttrn 8136 ax-pre-apti 8137 ax-pre-ltadd 8138 ax-pre-mulgt0 8139 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rab 2517 df-v 2802 df-sbc 3030 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-br 4087 df-opab 4149 df-id 4388 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-iota 5284 df-fun 5326 df-fv 5332 df-riota 5966 df-ov 6016 df-oprab 6017 df-mpo 6018 df-pnf 8206 df-mnf 8207 df-ltxr 8209 df-sub 8342 df-neg 8343 |
| This theorem is referenced by: rimul 8755 |
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