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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 12177 | . . . 4 ⊢ -1 < 0 | |
| 2 | neg1rr 12175 | . . . . 5 ⊢ -1 ∈ ℝ | |
| 3 | 0re 11177 | . . . . 5 ⊢ 0 ∈ ℝ | |
| 4 | 2, 3 | ltnsymi 11296 | . . . 4 ⊢ (-1 < 0 → ¬ 0 < -1) |
| 5 | 1, 4 | ax-mp 5 | . . 3 ⊢ ¬ 0 < -1 |
| 6 | ixi 11810 | . . . 4 ⊢ (i · i) = -1 | |
| 7 | 6 | breq2i 5105 | . . 3 ⊢ (0 < (i · i) ↔ 0 < -1) |
| 8 | 5, 7 | mtbir 325 | . 2 ⊢ ¬ 0 < (i · i) |
| 9 | ine0 11616 | . . 3 ⊢ i ≠ 0 | |
| 10 | msqgt0 11701 | . . 3 ⊢ ((i ∈ ℝ ∧ i ≠ 0) → 0 < (i · i)) | |
| 11 | 9, 10 | mpan2 701 | . 2 ⊢ (i ∈ ℝ → 0 < (i · i)) |
| 12 | 8, 11 | mto 199 | 1 ⊢ ¬ i ∈ ℝ |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∈ wcel 2141 ≠ wne 2956 class class class wbr 5097 (class class class)co 7391 ℝcr 11066 0cc0 11067 1c1 11068 ici 11069 · cmul 11072 < clt 11210 -cneg 11409 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-sep 5243 ax-nul 5253 ax-pow 5319 ax-pr 5387 ax-un 7713 ax-resscn 11124 ax-1cn 11125 ax-icn 11126 ax-addcl 11127 ax-addrcl 11128 ax-mulcl 11129 ax-mulrcl 11130 ax-mulcom 11131 ax-addass 11132 ax-mulass 11133 ax-distr 11134 ax-i2m1 11135 ax-1ne0 11136 ax-1rid 11137 ax-rnegex 11138 ax-rrecex 11139 ax-cnre 11140 ax-pre-lttri 11141 ax-pre-lttrn 11142 ax-pre-ltadd 11143 ax-pre-mulgt0 11144 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3061 df-ral 3076 df-rex 3086 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-br 5098 df-opab 5160 df-mpt 5179 df-id 5538 df-po 5551 df-so 5552 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-dm 5653 df-rn 5654 df-res 5655 df-ima 5656 df-iota 6472 df-fun 6518 df-fn 6519 df-f 6520 df-f1 6521 df-fo 6522 df-f1o 6523 df-fv 6524 df-riota 7348 df-ov 7394 df-oprab 7395 df-mpo 7396 df-er 8672 df-en 8922 df-dom 8923 df-sdom 8924 df-pnf 11212 df-mnf 11213 df-xr 11214 df-ltxr 11215 df-le 11216 df-sub 11410 df-neg 11411 |
| This theorem is referenced by: rimul 12180 nthruc 16275 areacirclem4 38171 ine1 42884 sqrtnegnre 47862 requad01 48204 |
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