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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 1190 | . . . . . . . . . 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 24354 | . . . . . . . . . 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 20611 | . . . . . . . . . 10 ⊢ ℂ = (Base‘ℂfld) | |
7 | 6 | subrgss 20035 | . . . . . . . . 9 ⊢ (𝐾 ∈ (SubRing‘ℂfld) → 𝐾 ⊆ ℂ) |
8 | 5, 7 | syl 17 | . . . . . . . 8 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → 𝐾 ⊆ ℂ) |
9 | simpl3 1192 | . . . . . . . 8 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → 𝐴 ∈ 𝐾) | |
10 | 8, 9 | sseldd 3921 | . . . . . . 7 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → 𝐴 ∈ ℂ) |
11 | 10 | negnegd 11333 | . . . . . 6 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → --𝐴 = 𝐴) |
12 | 11 | fveq2d 6770 | . . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → (√‘--𝐴) = (√‘𝐴)) |
13 | rpre 12748 | . . . . . . 7 ⊢ (-𝐴 ∈ ℝ+ → -𝐴 ∈ ℝ) | |
14 | 13 | adantl 482 | . . . . . 6 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → -𝐴 ∈ ℝ) |
15 | rpge0 12753 | . . . . . . 7 ⊢ (-𝐴 ∈ ℝ+ → 0 ≤ -𝐴) | |
16 | 15 | adantl 482 | . . . . . 6 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → 0 ≤ -𝐴) |
17 | 14, 16 | sqrtnegd 15143 | . . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → (√‘--𝐴) = (i · (√‘-𝐴))) |
18 | 12, 17 | eqtr3d 2780 | . . . 4 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → (√‘𝐴) = (i · (√‘-𝐴))) |
19 | simpl2 1191 | . . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → i ∈ 𝐾) | |
20 | cnfldneg 20634 | . . . . . . . 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 20040 | . . . . . . . . 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 2738 | . . . . . . . . 9 ⊢ (invg‘ℂfld) = (invg‘ℂfld) | |
25 | 24 | subginvcl 18774 | . . . . . . . 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 2840 | . . . . . 6 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → -𝐴 ∈ 𝐾) |
28 | 2, 3 | cphsqrtcl 24358 | . . . . . 6 ⊢ ((𝑊 ∈ ℂPreHil ∧ (-𝐴 ∈ 𝐾 ∧ -𝐴 ∈ ℝ ∧ 0 ≤ -𝐴)) → (√‘-𝐴) ∈ 𝐾) |
29 | 1, 27, 14, 16, 28 | syl13anc 1371 | . . . . 5 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → (√‘-𝐴) ∈ 𝐾) |
30 | cnfldmul 20613 | . . . . . 6 ⊢ · = (.r‘ℂfld) | |
31 | 30 | subrgmcl 20046 | . . . . 5 ⊢ ((𝐾 ∈ (SubRing‘ℂfld) ∧ i ∈ 𝐾 ∧ (√‘-𝐴) ∈ 𝐾) → (i · (√‘-𝐴)) ∈ 𝐾) |
32 | 5, 19, 29, 31 | syl3anc 1370 | . . . 4 ⊢ (((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) ∧ -𝐴 ∈ ℝ+) → (i · (√‘-𝐴)) ∈ 𝐾) |
33 | 18, 32 | eqeltrd 2839 | . . 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 24360 | . . . 4 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾 ∧ ¬ -𝐴 ∈ ℝ+) → (√‘𝐴) ∈ 𝐾) |
36 | 35 | 3expia 1120 | . . 3 ⊢ ((𝑊 ∈ ℂPreHil ∧ 𝐴 ∈ 𝐾) → (¬ -𝐴 ∈ ℝ+ → (√‘𝐴) ∈ 𝐾)) |
37 | 36 | 3adant2 1130 | . 2 ⊢ ((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) → (¬ -𝐴 ∈ ℝ+ → (√‘𝐴) ∈ 𝐾)) |
38 | 34, 37 | pm2.61d 179 | 1 ⊢ ((𝑊 ∈ ℂPreHil ∧ i ∈ 𝐾 ∧ 𝐴 ∈ 𝐾) → (√‘𝐴) ∈ 𝐾) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 396 ∧ w3a 1086 = wceq 1539 ∈ wcel 2106 ⊆ wss 3886 class class class wbr 5073 ‘cfv 6426 (class class class)co 7267 ℂcc 10879 ℝcr 10880 0cc0 10881 ici 10883 · cmul 10886 ≤ cle 11020 -cneg 11216 ℝ+crp 12740 √csqrt 14954 Basecbs 16922 Scalarcsca 16975 invgcminusg 18588 SubGrpcsubg 18759 SubRingcsubrg 20030 ℂfldccnfld 20607 ℂPreHilccph 24340 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-rep 5208 ax-sep 5221 ax-nul 5228 ax-pow 5286 ax-pr 5350 ax-un 7578 ax-cnex 10937 ax-resscn 10938 ax-1cn 10939 ax-icn 10940 ax-addcl 10941 ax-addrcl 10942 ax-mulcl 10943 ax-mulrcl 10944 ax-mulcom 10945 ax-addass 10946 ax-mulass 10947 ax-distr 10948 ax-i2m1 10949 ax-1ne0 10950 ax-1rid 10951 ax-rnegex 10952 ax-rrecex 10953 ax-cnre 10954 ax-pre-lttri 10955 ax-pre-lttrn 10956 ax-pre-ltadd 10957 ax-pre-mulgt0 10958 ax-pre-sup 10959 ax-addf 10960 ax-mulf 10961 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-reu 3071 df-rmo 3072 df-rab 3073 df-v 3431 df-sbc 3716 df-csb 3832 df-dif 3889 df-un 3891 df-in 3893 df-ss 3903 df-pss 3905 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-tp 4566 df-op 4568 df-uni 4840 df-iun 4926 df-br 5074 df-opab 5136 df-mpt 5157 df-tr 5191 df-id 5484 df-eprel 5490 df-po 5498 df-so 5499 df-fr 5539 df-we 5541 df-xp 5590 df-rel 5591 df-cnv 5592 df-co 5593 df-dm 5594 df-rn 5595 df-res 5596 df-ima 5597 df-pred 6195 df-ord 6262 df-on 6263 df-lim 6264 df-suc 6265 df-iota 6384 df-fun 6428 df-fn 6429 df-f 6430 df-f1 6431 df-fo 6432 df-f1o 6433 df-fv 6434 df-riota 7224 df-ov 7270 df-oprab 7271 df-mpo 7272 df-om 7703 df-1st 7820 df-2nd 7821 df-tpos 8029 df-frecs 8084 df-wrecs 8115 df-recs 8189 df-rdg 8228 df-1o 8284 df-er 8485 df-map 8604 df-en 8721 df-dom 8722 df-sdom 8723 df-fin 8724 df-sup 9188 df-pnf 11021 df-mnf 11022 df-xr 11023 df-ltxr 11024 df-le 11025 df-sub 11217 df-neg 11218 df-div 11643 df-nn 11984 df-2 12046 df-3 12047 df-4 12048 df-5 12049 df-6 12050 df-7 12051 df-8 12052 df-9 12053 df-n0 12244 df-z 12330 df-dec 12448 df-uz 12593 df-rp 12741 df-ico 13095 df-fz 13250 df-seq 13732 df-exp 13793 df-cj 14820 df-re 14821 df-im 14822 df-sqrt 14956 df-abs 14957 df-struct 16858 df-sets 16875 df-slot 16893 df-ndx 16905 df-base 16923 df-ress 16952 df-plusg 16985 df-mulr 16986 df-starv 16987 df-tset 16991 df-ple 16992 df-ds 16994 df-unif 16995 df-0g 17162 df-mgm 18336 df-sgrp 18385 df-mnd 18396 df-mhm 18440 df-grp 18590 df-minusg 18591 df-subg 18762 df-ghm 18842 df-cmn 19398 df-mgp 19731 df-ur 19748 df-ring 19795 df-cring 19796 df-oppr 19872 df-dvdsr 19893 df-unit 19894 df-invr 19924 df-dvr 19935 df-rnghom 19969 df-drng 20003 df-subrg 20032 df-staf 20115 df-srng 20116 df-lvec 20375 df-cnfld 20608 df-phl 20841 df-cph 24342 |
This theorem is referenced by: (None) |
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