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| Mirrors > Home > ILE Home > Th. List > ine0 | GIF version | ||
| Description: The imaginary unit i is not zero. (Contributed by NM, 6-May-1999.) |
| Ref | Expression |
|---|---|
| ine0 | ⊢ i ≠ 0 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0re 8157 | . . . . 5 ⊢ 0 ∈ ℝ | |
| 2 | 0lt1 8284 | . . . . 5 ⊢ 0 < 1 | |
| 3 | 1, 2 | gtneii 8253 | . . . 4 ⊢ 1 ≠ 0 |
| 4 | 3 | neii 2402 | . . 3 ⊢ ¬ 1 = 0 |
| 5 | oveq2 6015 | . . . . . 6 ⊢ (i = 0 → (i · i) = (i · 0)) | |
| 6 | ax-icn 8105 | . . . . . . 7 ⊢ i ∈ ℂ | |
| 7 | 6 | mul01i 8548 | . . . . . 6 ⊢ (i · 0) = 0 |
| 8 | 5, 7 | eqtr2di 2279 | . . . . 5 ⊢ (i = 0 → 0 = (i · i)) |
| 9 | 8 | oveq1d 6022 | . . . 4 ⊢ (i = 0 → (0 + 1) = ((i · i) + 1)) |
| 10 | ax-1cn 8103 | . . . . 5 ⊢ 1 ∈ ℂ | |
| 11 | 10 | addlidi 8300 | . . . 4 ⊢ (0 + 1) = 1 |
| 12 | ax-i2m1 8115 | . . . 4 ⊢ ((i · i) + 1) = 0 | |
| 13 | 9, 11, 12 | 3eqtr3g 2285 | . . 3 ⊢ (i = 0 → 1 = 0) |
| 14 | 4, 13 | mto 666 | . 2 ⊢ ¬ i = 0 |
| 15 | 14 | neir 2403 | 1 ⊢ i ≠ 0 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1395 ≠ wne 2400 (class class class)co 6007 0cc0 8010 1c1 8011 ici 8012 + caddc 8013 · cmul 8015 |
| 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 4202 ax-pow 4258 ax-pr 4293 ax-un 4524 ax-setind 4629 ax-cnex 8101 ax-resscn 8102 ax-1cn 8103 ax-1re 8104 ax-icn 8105 ax-addcl 8106 ax-addrcl 8107 ax-mulcl 8108 ax-addcom 8110 ax-mulcom 8111 ax-addass 8112 ax-distr 8114 ax-i2m1 8115 ax-0lt1 8116 ax-0id 8118 ax-rnegex 8119 ax-cnre 8121 ax-pre-ltirr 8122 |
| 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 2801 df-sbc 3029 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-br 4084 df-opab 4146 df-id 4384 df-xp 4725 df-rel 4726 df-cnv 4727 df-co 4728 df-dm 4729 df-iota 5278 df-fun 5320 df-fv 5326 df-riota 5960 df-ov 6010 df-oprab 6011 df-mpo 6012 df-pnf 8194 df-mnf 8195 df-ltxr 8197 df-sub 8330 |
| This theorem is referenced by: inelr 8742 |
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