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| Mirrors > Home > MPE Home > Th. List > inelr | Structured version Visualization version 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 | neg1lt0 12138 | . . . 4 ⊢ -1 < 0 | |
| 2 | neg1rr 12136 | . . . . 5 ⊢ -1 ∈ ℝ | |
| 3 | 0re 11137 | . . . . 5 ⊢ 0 ∈ ℝ | |
| 4 | 2, 3 | ltnsymi 11256 | . . . 4 ⊢ (-1 < 0 → ¬ 0 < -1) |
| 5 | 1, 4 | ax-mp 5 | . . 3 ⊢ ¬ 0 < -1 |
| 6 | ixi 11770 | . . . 4 ⊢ (i · i) = -1 | |
| 7 | 6 | breq2i 5094 | . . 3 ⊢ (0 < (i · i) ↔ 0 < -1) |
| 8 | 5, 7 | mtbir 323 | . 2 ⊢ ¬ 0 < (i · i) |
| 9 | ine0 11576 | . . 3 ⊢ i ≠ 0 | |
| 10 | msqgt0 11661 | . . 3 ⊢ ((i ∈ ℝ ∧ i ≠ 0) → 0 < (i · i)) | |
| 11 | 9, 10 | mpan2 692 | . 2 ⊢ (i ∈ ℝ → 0 < (i · i)) |
| 12 | 8, 11 | mto 197 | 1 ⊢ ¬ i ∈ ℝ |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∈ wcel 2114 ≠ wne 2933 class class class wbr 5086 (class class class)co 7360 ℝcr 11028 0cc0 11029 1c1 11030 ici 11031 · cmul 11034 < clt 11170 -cneg 11369 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 ax-resscn 11086 ax-1cn 11087 ax-icn 11088 ax-addcl 11089 ax-addrcl 11090 ax-mulcl 11091 ax-mulrcl 11092 ax-mulcom 11093 ax-addass 11094 ax-mulass 11095 ax-distr 11096 ax-i2m1 11097 ax-1ne0 11098 ax-1rid 11099 ax-rnegex 11100 ax-rrecex 11101 ax-cnre 11102 ax-pre-lttri 11103 ax-pre-lttrn 11104 ax-pre-ltadd 11105 ax-pre-mulgt0 11106 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5519 df-po 5532 df-so 5533 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7317 df-ov 7363 df-oprab 7364 df-mpo 7365 df-er 8636 df-en 8887 df-dom 8888 df-sdom 8889 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371 |
| This theorem is referenced by: rimul 12141 nthruc 16210 areacirclem4 38046 ine1 42760 sqrtnegnre 47767 requad01 48109 |
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