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Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > absimnre | Structured version Visualization version GIF version |
Description: The absolute value of the imaginary part of a non-real, complex number, is strictly positive. (Contributed by Glauco Siliprandi, 5-Feb-2022.) |
Ref | Expression |
---|---|
absimnre.1 | ⊢ (𝜑 → 𝐴 ∈ ℂ) |
absimnre.2 | ⊢ (𝜑 → ¬ 𝐴 ∈ ℝ) |
Ref | Expression |
---|---|
absimnre | ⊢ (𝜑 → (abs‘(ℑ‘𝐴)) ∈ ℝ+) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | absimnre.1 | . . . 4 ⊢ (𝜑 → 𝐴 ∈ ℂ) | |
2 | 1 | imcld 15220 | . . 3 ⊢ (𝜑 → (ℑ‘𝐴) ∈ ℝ) |
3 | 2 | recnd 11280 | . 2 ⊢ (𝜑 → (ℑ‘𝐴) ∈ ℂ) |
4 | absimnre.2 | . . . 4 ⊢ (𝜑 → ¬ 𝐴 ∈ ℝ) | |
5 | reim0b 15144 | . . . . 5 ⊢ (𝐴 ∈ ℂ → (𝐴 ∈ ℝ ↔ (ℑ‘𝐴) = 0)) | |
6 | 1, 5 | syl 17 | . . . 4 ⊢ (𝜑 → (𝐴 ∈ ℝ ↔ (ℑ‘𝐴) = 0)) |
7 | 4, 6 | mtbid 324 | . . 3 ⊢ (𝜑 → ¬ (ℑ‘𝐴) = 0) |
8 | 7 | neqned 2943 | . 2 ⊢ (𝜑 → (ℑ‘𝐴) ≠ 0) |
9 | 3, 8 | absrpcld 15473 | 1 ⊢ (𝜑 → (abs‘(ℑ‘𝐴)) ∈ ℝ+) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 = wceq 1535 ∈ wcel 2104 ‘cfv 6558 ℂcc 11144 ℝcr 11145 0cc0 11146 ℝ+crp 13025 ℑcim 15123 abscabs 15259 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1963 ax-7 2003 ax-8 2106 ax-9 2114 ax-10 2137 ax-11 2153 ax-12 2173 ax-ext 2704 ax-sep 5300 ax-nul 5307 ax-pow 5366 ax-pr 5430 ax-un 7747 ax-cnex 11202 ax-resscn 11203 ax-1cn 11204 ax-icn 11205 ax-addcl 11206 ax-addrcl 11207 ax-mulcl 11208 ax-mulrcl 11209 ax-mulcom 11210 ax-addass 11211 ax-mulass 11212 ax-distr 11213 ax-i2m1 11214 ax-1ne0 11215 ax-1rid 11216 ax-rnegex 11217 ax-rrecex 11218 ax-cnre 11219 ax-pre-lttri 11220 ax-pre-lttrn 11221 ax-pre-ltadd 11222 ax-pre-mulgt0 11223 ax-pre-sup 11224 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1538 df-fal 1548 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2536 df-eu 2565 df-clab 2711 df-cleq 2725 df-clel 2812 df-nfc 2888 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3479 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-op 4637 df-uni 4915 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5635 df-we 5637 df-xp 5689 df-rel 5690 df-cnv 5691 df-co 5692 df-dm 5693 df-rn 5694 df-res 5695 df-ima 5696 df-pred 6317 df-ord 6383 df-on 6384 df-lim 6385 df-suc 6386 df-iota 6510 df-fun 6560 df-fn 6561 df-f 6562 df-f1 6563 df-fo 6564 df-f1o 6565 df-fv 6566 df-riota 7381 df-ov 7428 df-oprab 7429 df-mpo 7430 df-om 7881 df-2nd 8008 df-frecs 8299 df-wrecs 8330 df-recs 8404 df-rdg 8443 df-er 8738 df-en 8979 df-dom 8980 df-sdom 8981 df-sup 9473 df-pnf 11288 df-mnf 11289 df-xr 11290 df-ltxr 11291 df-le 11292 df-sub 11485 df-neg 11486 df-div 11912 df-nn 12258 df-2 12320 df-3 12321 df-n0 12518 df-z 12605 df-uz 12870 df-rp 13026 df-seq 14029 df-exp 14089 df-cj 15124 df-re 15125 df-im 15126 df-sqrt 15260 df-abs 15261 |
This theorem is referenced by: cnrefiisplem 45735 |
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