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| Mirrors > Home > MPE Home > Th. List > abssubne0 | Structured version Visualization version GIF version | ||
| Description: If the absolute value of a complex number is less than a real, its difference from the real is nonzero. (Contributed by NM, 2-Nov-2007.) (Proof shortened by Mario Carneiro, 29-May-2016.) |
| Ref | Expression |
|---|---|
| abssubne0 | ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℝ ∧ (abs‘𝐴) < 𝐵) → (𝐵 − 𝐴) ≠ 0) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simplr 781 | . . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℝ) ∧ (abs‘𝐴) < 𝐵) → 𝐵 ∈ ℝ) | |
| 2 | 1 | recnd 11342 | . . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℝ) ∧ (abs‘𝐴) < 𝐵) → 𝐵 ∈ ℂ) |
| 3 | simpll 779 | . . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℝ) ∧ (abs‘𝐴) < 𝐵) → 𝐴 ∈ ℂ) | |
| 4 | abscl 15452 | . . . . . 6 ⊢ (𝐴 ∈ ℂ → (abs‘𝐴) ∈ ℝ) | |
| 5 | 3, 4 | syl 18 | . . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℝ) ∧ (abs‘𝐴) < 𝐵) → (abs‘𝐴) ∈ ℝ) |
| 6 | abscl 15452 | . . . . . . 7 ⊢ (𝐵 ∈ ℂ → (abs‘𝐵) ∈ ℝ) | |
| 7 | 2, 6 | syl 18 | . . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℝ) ∧ (abs‘𝐴) < 𝐵) → (abs‘𝐵) ∈ ℝ) |
| 8 | simpr 490 | . . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℝ) ∧ (abs‘𝐴) < 𝐵) → (abs‘𝐴) < 𝐵) | |
| 9 | leabs 15473 | . . . . . . 7 ⊢ (𝐵 ∈ ℝ → 𝐵 ≤ (abs‘𝐵)) | |
| 10 | 1, 9 | syl 18 | . . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℝ) ∧ (abs‘𝐴) < 𝐵) → 𝐵 ≤ (abs‘𝐵)) |
| 11 | 5, 1, 7, 8, 10 | ltletrd 11475 | . . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℝ) ∧ (abs‘𝐴) < 𝐵) → (abs‘𝐴) < (abs‘𝐵)) |
| 12 | 5, 11 | gtned 11450 | . . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℝ) ∧ (abs‘𝐴) < 𝐵) → (abs‘𝐵) ≠ (abs‘𝐴)) |
| 13 | fveq2 6888 | . . . . 5 ⊢ (𝐵 = 𝐴 → (abs‘𝐵) = (abs‘𝐴)) | |
| 14 | 13 | necon3i 2987 | . . . 4 ⊢ ((abs‘𝐵) ≠ (abs‘𝐴) → 𝐵 ≠ 𝐴) |
| 15 | 12, 14 | syl 18 | . . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℝ) ∧ (abs‘𝐴) < 𝐵) → 𝐵 ≠ 𝐴) |
| 16 | 2, 3, 15 | subne0d 11684 | . 2 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℝ) ∧ (abs‘𝐴) < 𝐵) → (𝐵 − 𝐴) ≠ 0) |
| 17 | 16 | 3impa 1127 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℝ ∧ (abs‘𝐴) < 𝐵) → (𝐵 − 𝐴) ≠ 0) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∧ w3a 1103 ∈ wcel 2144 ≠ wne 2955 class class class wbr 5102 ‘cfv 6541 (class class class)co 7422 ℂcc 11203 ℝcr 11204 0cc0 11205 < clt 11348 ≤ cle 11349 − cmin 11546 abscabs 15408 |
| 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 7753 ax-cnex 11261 ax-resscn 11262 ax-1cn 11263 ax-icn 11264 ax-addcl 11265 ax-addrcl 11266 ax-mulcl 11267 ax-mulrcl 11268 ax-mulcom 11269 ax-addass 11270 ax-mulass 11271 ax-distr 11272 ax-i2m1 11273 ax-1ne0 11274 ax-1rid 11275 ax-rnegex 11276 ax-rrecex 11277 ax-cnre 11278 ax-pre-lttri 11279 ax-pre-lttrn 11280 ax-pre-ltadd 11281 ax-pre-mulgt0 11282 ax-pre-sup 11283 |
| 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-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3848 df-ss 3897 df-pss 4013 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 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-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-riota 7379 df-ov 7425 df-oprab 7426 df-mpo 7427 df-om 7880 df-2nd 8004 df-frecs 8304 df-wrecs 8335 df-recs 8384 df-rdg 8423 df-er 8722 df-en 8979 df-dom 8980 df-sdom 8981 df-sup 9439 df-pnf 11350 df-mnf 11351 df-xr 11352 df-ltxr 11353 df-le 11354 df-sub 11548 df-neg 11549 df-div 11979 df-nn 12341 df-2 12410 df-3 12411 df-n0 12612 df-z 12699 df-uz 12971 df-rp 13126 df-seq 14150 df-exp 14210 df-cj 15273 df-re 15274 df-im 15275 df-sqrt 15409 df-abs 15410 |
| This theorem is used by: binomcxplemnotnn0 45447 |
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