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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 12312 | . . . 4 ⊢ -1 < 0 | |
| 2 | neg1rr 12310 | . . . . 5 ⊢ -1 ∈ ℝ | |
| 3 | 0re 11314 | . . . . 5 ⊢ 0 ∈ ℝ | |
| 4 | 2, 3 | ltnsymi 11433 | . . . 4 ⊢ ( -1 < 0 → ¬ 0 < -1) |
| 5 | 1, 4 | ax-mp 5 | . . 3 ⊢ ¬ 0 < -1 |
| 6 | ixi 11949 | . . . 4 ⊢ (i · i) = -1 | |
| 7 | 6 | breq2i 5110 | . . 3 ⊢ (0 < (i · i) ↔ 0 < -1) |
| 8 | 5, 7 | mtbir 326 | . 2 ⊢ ¬ 0 < (i · i) |
| 9 | ine0 11755 | . . 3 ⊢ i ≠ 0 | |
| 10 | msqgt0 11840 | . . 3 ⊢ ((i ∈ ℝ ∧ i ≠ 0) → 0 < (i · i)) | |
| 11 | 9, 10 | mpan2 704 | . 2 ⊢ (i ∈ ℝ → 0 < (i · i)) |
| 12 | 8, 11 | mto 200 | 1 ⊢ ¬ i ∈ ℝ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 ∈ wcel 2144 ≠ wne 2955 class class class wbr 5102 (class class class)co 7421 ℝcr 11203 0cc0 11204 1c1 11205 ici 11206 · cmul 11209 < clt 11347 -cneg 11546 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7752 ax-resscn 11261 ax-1cn 11262 ax-icn 11263 ax-addcl 11264 ax-addrcl 11265 ax-mulcl 11266 ax-mulrcl 11267 ax-mulcom 11268 ax-addass 11269 ax-mulass 11270 ax-distr 11271 ax-i2m1 11272 ax-1ne0 11273 ax-1rid 11274 ax-rnegex 11275 ax-rrecex 11276 ax-cnre 11277 ax-pre-lttri 11278 ax-pre-lttrn 11279 ax-pre-ltadd 11280 ax-pre-mulgt0 11281 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5545 df-po 5558 df-so 5559 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-iota 6494 df-fun 6541 df-fn 6542 df-f 6543 df-f1 6544 df-fo 6545 df-f1o 6546 df-fv 6547 df-riota 7378 df-ov 7424 df-oprab 7425 df-mpo 7426 df-er 8721 df-en 8978 df-dom 8979 df-sdom 8980 df-pnf 11349 df-mnf 11350 df-xr 11351 df-ltxr 11352 df-le 11353 df-sub 11547 df-neg 11548 |
| This theorem is used by: rimul 12315 nthruc 16426 areacirclem4 38723 ine1 43465 sqrtrrnpoly 48036 sqrtnegnre 48471 requad01 48813 |
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