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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 8178 | . . . . 5 ⊢ 0 ∈ ℝ | |
| 2 | 0lt1 8305 | . . . . 5 ⊢ 0 < 1 | |
| 3 | 1, 2 | gtneii 8274 | . . . 4 ⊢ 1 ≠ 0 |
| 4 | 3 | neii 2404 | . . 3 ⊢ ¬ 1 = 0 |
| 5 | oveq2 6025 | . . . . . 6 ⊢ (i = 0 → (i · i) = (i · 0)) | |
| 6 | ax-icn 8126 | . . . . . . 7 ⊢ i ∈ ℂ | |
| 7 | 6 | mul01i 8569 | . . . . . 6 ⊢ (i · 0) = 0 |
| 8 | 5, 7 | eqtr2di 2281 | . . . . 5 ⊢ (i = 0 → 0 = (i · i)) |
| 9 | 8 | oveq1d 6032 | . . . 4 ⊢ (i = 0 → (0 + 1) = ((i · i) + 1)) |
| 10 | ax-1cn 8124 | . . . . 5 ⊢ 1 ∈ ℂ | |
| 11 | 10 | addlidi 8321 | . . . 4 ⊢ (0 + 1) = 1 |
| 12 | ax-i2m1 8136 | . . . 4 ⊢ ((i · i) + 1) = 0 | |
| 13 | 9, 11, 12 | 3eqtr3g 2287 | . . 3 ⊢ (i = 0 → 1 = 0) |
| 14 | 4, 13 | mto 668 | . 2 ⊢ ¬ i = 0 |
| 15 | 14 | neir 2405 | 1 ⊢ i ≠ 0 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1397 ≠ wne 2402 (class class class)co 6017 0cc0 8031 1c1 8032 ici 8033 + caddc 8034 · cmul 8036 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-pr 4299 ax-un 4530 ax-setind 4635 ax-cnex 8122 ax-resscn 8123 ax-1cn 8124 ax-1re 8125 ax-icn 8126 ax-addcl 8127 ax-addrcl 8128 ax-mulcl 8129 ax-addcom 8131 ax-mulcom 8132 ax-addass 8133 ax-distr 8135 ax-i2m1 8136 ax-0lt1 8137 ax-0id 8139 ax-rnegex 8140 ax-cnre 8142 ax-pre-ltirr 8143 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ne 2403 df-nel 2498 df-ral 2515 df-rex 2516 df-reu 2517 df-rab 2519 df-v 2804 df-sbc 3032 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-br 4089 df-opab 4151 df-id 4390 df-xp 4731 df-rel 4732 df-cnv 4733 df-co 4734 df-dm 4735 df-iota 5286 df-fun 5328 df-fv 5334 df-riota 5970 df-ov 6020 df-oprab 6021 df-mpo 6022 df-pnf 8215 df-mnf 8216 df-ltxr 8218 df-sub 8351 |
| This theorem is referenced by: inelr 8763 |
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