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Mirrors > Home > MPE Home > Th. List > cphsqrtcl3 | Structured version Visualization version GIF version |
Description: If the scalar field of a subcomplex pre-Hilbert space contains the imaginary unit i, then it is closed under square roots (i.e., it is quadratically closed). (Contributed by Mario Carneiro, 11-Oct-2015.) |
Ref | Expression |
---|---|
cphsca.f | ⊢ 𝐹 = (Scalar‘𝑊) |
cphsca.k | ⊢ 𝐾 = (Base‘𝐹) |
Ref | Expression |
---|---|
cphsqrtcl3 | ⊢ ((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) → (√‘𝐴) ∈ 𝐾) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpl1 1183 | . . . . . . . . . 10 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → 𝑊 ∈ ℂPreHil) | |
2 | cphsca.f | . . . . . . . . . . 11 ⊢ 𝐹 = (Scalar‘𝑊) | |
3 | cphsca.k | . . . . . . . . . . 11 ⊢ 𝐾 = (Base‘𝐹) | |
4 | 2, 3 | cphsubrg 23711 | . . . . . . . . . 10 ⊢ (𝑊 ∈ ℂPreHil → 𝐾 ∈ (SubRing‘ℂfld)) |
5 | 1, 4 | syl 17 | . . . . . . . . 9 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → 𝐾 ∈ (SubRing‘ℂfld)) |
6 | cnfldbas 20477 | . . . . . . . . . 10 ⊢ ℂ = (Base‘ℂfld) | |
7 | 6 | subrgss 19465 | . . . . . . . . 9 ⊢ (𝐾 ∈ (SubRing‘ℂfld) → 𝐾 ⊆ ℂ) |
8 | 5, 7 | syl 17 | . . . . . . . 8 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → 𝐾 ⊆ ℂ) |
9 | simpl3 1185 | . . . . . . . 8 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → 𝐴 ∈ 𝐾) | |
10 | 8, 9 | sseldd 3965 | . . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → 𝐴 ∈ ℂ) |
11 | 10 | negnegd 10976 | . . . . . 6 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → --𝐴 = 𝐴) |
12 | 11 | fveq2d 6667 | . . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → (√‘--𝐴) = (√‘𝐴)) |
13 | rpre 12385 | . . . . . . 7 ⊢ (-𝐴 ∈ ℝ+ → -𝐴 ∈ ℝ) | |
14 | 13 | adantl 482 | . . . . . 6 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → -𝐴 ∈ ℝ) |
15 | rpge0 12390 | . . . . . . 7 ⊢ (-𝐴 ∈ ℝ+ → 0 ≤ -𝐴) | |
16 | 15 | adantl 482 | . . . . . 6 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → 0 ≤ -𝐴) |
17 | 14, 16 | sqrtnegd 14769 | . . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → (√‘--𝐴) = (i · (√‘-𝐴))) |
18 | 12, 17 | eqtr3d 2855 | . . . 4 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → (√‘𝐴) = (i · (√‘-𝐴))) |
19 | simpl2 1184 | . . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → i ∈ 𝐾) | |
20 | cnfldneg 20499 | . . . . . . . 8 ⊢ (𝐴 ∈ ℂ → ((invg‘ℂfld)‘𝐴) = -𝐴) | |
21 | 10, 20 | syl 17 | . . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → ((invg‘ℂfld)‘𝐴) = -𝐴) |
22 | subrgsubg 19470 | . . . . . . . . 9 ⊢ (𝐾 ∈ (SubRing‘ℂfld) → 𝐾 ∈ (SubGrp‘ℂfld)) | |
23 | 5, 22 | syl 17 | . . . . . . . 8 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → 𝐾 ∈ (SubGrp‘ℂfld)) |
24 | eqid 2818 | . . . . . . . . 9 ⊢ (invg‘ℂfld) = (invg‘ℂfld) | |
25 | 24 | subginvcl 18226 | . . . . . . . 8 ⊢ ((𝐾 ∈ (SubGrp‘ℂfld) ∧ 𝐴 ∈ 𝐾) → ((invg‘ℂfld)‘𝐴) ∈ 𝐾) |
26 | 23, 9, 25 | syl2anc 584 | . . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → ((invg‘ℂfld)‘𝐴) ∈ 𝐾) |
27 | 21, 26 | eqeltrrd 2911 | . . . . . 6 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → -𝐴 ∈ 𝐾) |
28 | 2, 3 | cphsqrtcl 23715 | . . . . . 6 ⊢ ((𝑊 ∈ ℂPreHil ∧ (-𝐴 ∈ 𝐾 ∧ -𝐴 ∈ ℝ ∧ 0 ≤ -𝐴)) → (√‘-𝐴) ∈ 𝐾) |
29 | 1, 27, 14, 16, 28 | syl13anc 1364 | . . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → (√‘-𝐴) ∈ 𝐾) |
30 | cnfldmul 20479 | . . . . . 6 ⊢ · = (.r‘ℂfld) | |
31 | 30 | subrgmcl 19476 | . . . . 5 ⊢ ((𝐾 ∈ (SubRing‘ℂfld) ∧ i ∈ 𝐾 ∧ (√‘-𝐴) ∈ 𝐾) → (i · (√‘-𝐴)) ∈ 𝐾) |
32 | 5, 19, 29, 31 | syl3anc 1363 | . . . 4 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → (i · (√‘-𝐴)) ∈ 𝐾) |
33 | 18, 32 | eqeltrd 2910 | . . 3 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → (√‘𝐴) ∈ 𝐾) |
34 | 33 | ex 413 | . 2 ⊢ ((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) → (-𝐴 ∈ ℝ+ → (√‘𝐴) ∈ 𝐾)) |
35 | 2, 3 | cphsqrtcl2 23717 | . . . 4 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ+) → (√‘𝐴) ∈ 𝐾) |
36 | 35 | 3expia 1113 | . . 3 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾) → (¬ -𝐴 ∈ ℝ+ → (√‘𝐴) ∈ 𝐾)) |
37 | 36 | 3adant2 1123 | . 2 ⊢ ((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) → (¬ -𝐴 ∈ ℝ+ → (√‘𝐴) ∈ 𝐾)) |
38 | 34, 37 | pm2.61d 180 | 1 ⊢ ((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) → (√‘𝐴) ∈ 𝐾) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 396 ∧ w3a 1079 = wceq 1528 ∈ wcel 2105 ⊆ wss 3933 class class class wbr 5057 ‘cfv 6348 (class class class)co 7145 ℂcc 10523 ℝcr 10524 0cc0 10525 ici 10527 · cmul 10530 ≤ cle 10664 -cneg 10859 ℝ+crp 12377 √csqrt 14580 Basecbs 16471 Scalarcsca 16556 invgcminusg 18042 SubGrpcsubg 18211 SubRingcsubrg 19460 ℂfldccnfld 20473 ℂPreHilccph 23697 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1787 ax-4 1801 ax-5 1902 ax-6 1961 ax-7 2006 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2151 ax-12 2167 ax-ext 2790 ax-rep 5181 ax-sep 5194 ax-nul 5201 ax-pow 5257 ax-pr 5320 ax-un 7450 ax-cnex 10581 ax-resscn 10582 ax-1cn 10583 ax-icn 10584 ax-addcl 10585 ax-addrcl 10586 ax-mulcl 10587 ax-mulrcl 10588 ax-mulcom 10589 ax-addass 10590 ax-mulass 10591 ax-distr 10592 ax-i2m1 10593 ax-1ne0 10594 ax-1rid 10595 ax-rnegex 10596 ax-rrecex 10597 ax-cnre 10598 ax-pre-lttri 10599 ax-pre-lttrn 10600 ax-pre-ltadd 10601 ax-pre-mulgt0 10602 ax-pre-sup 10603 ax-addf 10604 ax-mulf 10605 |
This theorem depends on definitions: df-bi 208 df-an 397 df-or 842 df-3or 1080 df-3an 1081 df-tru 1531 df-ex 1772 df-nf 1776 df-sb 2061 df-mo 2615 df-eu 2647 df-clab 2797 df-cleq 2811 df-clel 2890 df-nfc 2960 df-ne 3014 df-nel 3121 df-ral 3140 df-rex 3141 df-reu 3142 df-rmo 3143 df-rab 3144 df-v 3494 df-sbc 3770 df-csb 3881 df-dif 3936 df-un 3938 df-in 3940 df-ss 3949 df-pss 3951 df-nul 4289 df-if 4464 df-pw 4537 df-sn 4558 df-pr 4560 df-tp 4562 df-op 4564 df-uni 4831 df-int 4868 df-iun 4912 df-br 5058 df-opab 5120 df-mpt 5138 df-tr 5164 df-id 5453 df-eprel 5458 df-po 5467 df-so 5468 df-fr 5507 df-we 5509 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-pred 6141 df-ord 6187 df-on 6188 df-lim 6189 df-suc 6190 df-iota 6307 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-fv 6356 df-riota 7103 df-ov 7148 df-oprab 7149 df-mpo 7150 df-om 7570 df-1st 7678 df-2nd 7679 df-tpos 7881 df-wrecs 7936 df-recs 7997 df-rdg 8035 df-1o 8091 df-oadd 8095 df-er 8278 df-map 8397 df-en 8498 df-dom 8499 df-sdom 8500 df-fin 8501 df-sup 8894 df-pnf 10665 df-mnf 10666 df-xr 10667 df-ltxr 10668 df-le 10669 df-sub 10860 df-neg 10861 df-div 11286 df-nn 11627 df-2 11688 df-3 11689 df-4 11690 df-5 11691 df-6 11692 df-7 11693 df-8 11694 df-9 11695 df-n0 11886 df-z 11970 df-dec 12087 df-uz 12232 df-rp 12378 df-ico 12732 df-fz 12881 df-seq 13358 df-exp 13418 df-cj 14446 df-re 14447 df-im 14448 df-sqrt 14582 df-abs 14583 df-struct 16473 df-ndx 16474 df-slot 16475 df-base 16477 df-sets 16478 df-ress 16479 df-plusg 16566 df-mulr 16567 df-starv 16568 df-tset 16572 df-ple 16573 df-ds 16575 df-unif 16576 df-0g 16703 df-mgm 17840 df-sgrp 17889 df-mnd 17900 df-mhm 17944 df-grp 18044 df-minusg 18045 df-subg 18214 df-ghm 18294 df-cmn 18837 df-mgp 19169 df-ur 19181 df-ring 19228 df-cring 19229 df-oppr 19302 df-dvdsr 19320 df-unit 19321 df-invr 19351 df-dvr 19362 df-rnghom 19396 df-drng 19433 df-subrg 19462 df-staf 19545 df-srng 19546 df-lvec 19804 df-cnfld 20474 df-phl 20698 df-cph 23699 |
This theorem is referenced by: (None) |
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