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Mirrors > Home > HSE Home > Th. List > osum | Structured version Visualization version GIF version |
Description: If two closed subspaces of a Hilbert space are orthogonal, their subspace sum equals their subspace join. Lemma 3 of [Kalmbach] p. 67. (Contributed by NM, 31-Oct-2005.) (New usage is discouraged.) |
Ref | Expression |
---|---|
osum | ⊢ ((𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐴 ⊆ (⊥‘𝐵)) → (𝐴 +ℋ 𝐵) = (𝐴 ∨ℋ 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseq1 3991 | . . . 4 ⊢ (𝐴 = if(𝐴 ∈ Cℋ , 𝐴, ℋ) → (𝐴 ⊆ (⊥‘𝐵) ↔ if(𝐴 ∈ Cℋ , 𝐴, ℋ) ⊆ (⊥‘𝐵))) | |
2 | oveq1 7157 | . . . . 5 ⊢ (𝐴 = if(𝐴 ∈ Cℋ , 𝐴, ℋ) → (𝐴 +ℋ 𝐵) = (if(𝐴 ∈ Cℋ , 𝐴, ℋ) +ℋ 𝐵)) | |
3 | oveq1 7157 | . . . . 5 ⊢ (𝐴 = if(𝐴 ∈ Cℋ , 𝐴, ℋ) → (𝐴 ∨ℋ 𝐵) = (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ∨ℋ 𝐵)) | |
4 | 2, 3 | eqeq12d 2837 | . . . 4 ⊢ (𝐴 = if(𝐴 ∈ Cℋ , 𝐴, ℋ) → ((𝐴 +ℋ 𝐵) = (𝐴 ∨ℋ 𝐵) ↔ (if(𝐴 ∈ Cℋ , 𝐴, ℋ) +ℋ 𝐵) = (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ∨ℋ 𝐵))) |
5 | 1, 4 | imbi12d 347 | . . 3 ⊢ (𝐴 = if(𝐴 ∈ Cℋ , 𝐴, ℋ) → ((𝐴 ⊆ (⊥‘𝐵) → (𝐴 +ℋ 𝐵) = (𝐴 ∨ℋ 𝐵)) ↔ (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ⊆ (⊥‘𝐵) → (if(𝐴 ∈ Cℋ , 𝐴, ℋ) +ℋ 𝐵) = (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ∨ℋ 𝐵)))) |
6 | fveq2 6664 | . . . . 5 ⊢ (𝐵 = if(𝐵 ∈ Cℋ , 𝐵, ℋ) → (⊥‘𝐵) = (⊥‘if(𝐵 ∈ Cℋ , 𝐵, ℋ))) | |
7 | 6 | sseq2d 3998 | . . . 4 ⊢ (𝐵 = if(𝐵 ∈ Cℋ , 𝐵, ℋ) → (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ⊆ (⊥‘𝐵) ↔ if(𝐴 ∈ Cℋ , 𝐴, ℋ) ⊆ (⊥‘if(𝐵 ∈ Cℋ , 𝐵, ℋ)))) |
8 | oveq2 7158 | . . . . 5 ⊢ (𝐵 = if(𝐵 ∈ Cℋ , 𝐵, ℋ) → (if(𝐴 ∈ Cℋ , 𝐴, ℋ) +ℋ 𝐵) = (if(𝐴 ∈ Cℋ , 𝐴, ℋ) +ℋ if(𝐵 ∈ Cℋ , 𝐵, ℋ))) | |
9 | oveq2 7158 | . . . . 5 ⊢ (𝐵 = if(𝐵 ∈ Cℋ , 𝐵, ℋ) → (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ∨ℋ 𝐵) = (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ∨ℋ if(𝐵 ∈ Cℋ , 𝐵, ℋ))) | |
10 | 8, 9 | eqeq12d 2837 | . . . 4 ⊢ (𝐵 = if(𝐵 ∈ Cℋ , 𝐵, ℋ) → ((if(𝐴 ∈ Cℋ , 𝐴, ℋ) +ℋ 𝐵) = (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ∨ℋ 𝐵) ↔ (if(𝐴 ∈ Cℋ , 𝐴, ℋ) +ℋ if(𝐵 ∈ Cℋ , 𝐵, ℋ)) = (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ∨ℋ if(𝐵 ∈ Cℋ , 𝐵, ℋ)))) |
11 | 7, 10 | imbi12d 347 | . . 3 ⊢ (𝐵 = if(𝐵 ∈ Cℋ , 𝐵, ℋ) → ((if(𝐴 ∈ Cℋ , 𝐴, ℋ) ⊆ (⊥‘𝐵) → (if(𝐴 ∈ Cℋ , 𝐴, ℋ) +ℋ 𝐵) = (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ∨ℋ 𝐵)) ↔ (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ⊆ (⊥‘if(𝐵 ∈ Cℋ , 𝐵, ℋ)) → (if(𝐴 ∈ Cℋ , 𝐴, ℋ) +ℋ if(𝐵 ∈ Cℋ , 𝐵, ℋ)) = (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ∨ℋ if(𝐵 ∈ Cℋ , 𝐵, ℋ))))) |
12 | ifchhv 29015 | . . . 4 ⊢ if(𝐴 ∈ Cℋ , 𝐴, ℋ) ∈ Cℋ | |
13 | ifchhv 29015 | . . . 4 ⊢ if(𝐵 ∈ Cℋ , 𝐵, ℋ) ∈ Cℋ | |
14 | 12, 13 | osumi 29413 | . . 3 ⊢ (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ⊆ (⊥‘if(𝐵 ∈ Cℋ , 𝐵, ℋ)) → (if(𝐴 ∈ Cℋ , 𝐴, ℋ) +ℋ if(𝐵 ∈ Cℋ , 𝐵, ℋ)) = (if(𝐴 ∈ Cℋ , 𝐴, ℋ) ∨ℋ if(𝐵 ∈ Cℋ , 𝐵, ℋ))) |
15 | 5, 11, 14 | dedth2h 4523 | . 2 ⊢ ((𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → (𝐴 ⊆ (⊥‘𝐵) → (𝐴 +ℋ 𝐵) = (𝐴 ∨ℋ 𝐵))) |
16 | 15 | 3impia 1113 | 1 ⊢ ((𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐴 ⊆ (⊥‘𝐵)) → (𝐴 +ℋ 𝐵) = (𝐴 ∨ℋ 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ w3a 1083 = wceq 1533 ∈ wcel 2110 ⊆ wss 3935 ifcif 4466 ‘cfv 6349 (class class class)co 7150 ℋchba 28690 Cℋ cch 28700 ⊥cort 28701 +ℋ cph 28702 ∨ℋ chj 28704 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-rep 5182 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 ax-inf2 9098 ax-cc 9851 ax-cnex 10587 ax-resscn 10588 ax-1cn 10589 ax-icn 10590 ax-addcl 10591 ax-addrcl 10592 ax-mulcl 10593 ax-mulrcl 10594 ax-mulcom 10595 ax-addass 10596 ax-mulass 10597 ax-distr 10598 ax-i2m1 10599 ax-1ne0 10600 ax-1rid 10601 ax-rnegex 10602 ax-rrecex 10603 ax-cnre 10604 ax-pre-lttri 10605 ax-pre-lttrn 10606 ax-pre-ltadd 10607 ax-pre-mulgt0 10608 ax-pre-sup 10609 ax-addf 10610 ax-mulf 10611 ax-hilex 28770 ax-hfvadd 28771 ax-hvcom 28772 ax-hvass 28773 ax-hv0cl 28774 ax-hvaddid 28775 ax-hfvmul 28776 ax-hvmulid 28777 ax-hvmulass 28778 ax-hvdistr1 28779 ax-hvdistr2 28780 ax-hvmul0 28781 ax-hfi 28850 ax-his1 28853 ax-his2 28854 ax-his3 28855 ax-his4 28856 ax-hcompl 28973 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-fal 1546 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-int 4869 df-iun 4913 df-iin 4914 df-br 5059 df-opab 5121 df-mpt 5139 df-tr 5165 df-id 5454 df-eprel 5459 df-po 5468 df-so 5469 df-fr 5508 df-se 5509 df-we 5510 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-ima 5562 df-pred 6142 df-ord 6188 df-on 6189 df-lim 6190 df-suc 6191 df-iota 6308 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 df-fv 6357 df-isom 6358 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-of 7403 df-om 7575 df-1st 7683 df-2nd 7684 df-supp 7825 df-wrecs 7941 df-recs 8002 df-rdg 8040 df-1o 8096 df-2o 8097 df-oadd 8100 df-omul 8101 df-er 8283 df-map 8402 df-pm 8403 df-ixp 8456 df-en 8504 df-dom 8505 df-sdom 8506 df-fin 8507 df-fsupp 8828 df-fi 8869 df-sup 8900 df-inf 8901 df-oi 8968 df-card 9362 df-acn 9365 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-div 11292 df-nn 11633 df-2 11694 df-3 11695 df-4 11696 df-5 11697 df-6 11698 df-7 11699 df-8 11700 df-9 11701 df-n0 11892 df-z 11976 df-dec 12093 df-uz 12238 df-q 12343 df-rp 12384 df-xneg 12501 df-xadd 12502 df-xmul 12503 df-ioo 12736 df-ico 12738 df-icc 12739 df-fz 12887 df-fzo 13028 df-fl 13156 df-seq 13364 df-exp 13424 df-hash 13685 df-cj 14452 df-re 14453 df-im 14454 df-sqrt 14588 df-abs 14589 df-clim 14839 df-rlim 14840 df-sum 15037 df-struct 16479 df-ndx 16480 df-slot 16481 df-base 16483 df-sets 16484 df-ress 16485 df-plusg 16572 df-mulr 16573 df-starv 16574 df-sca 16575 df-vsca 16576 df-ip 16577 df-tset 16578 df-ple 16579 df-ds 16581 df-unif 16582 df-hom 16583 df-cco 16584 df-rest 16690 df-topn 16691 df-0g 16709 df-gsum 16710 df-topgen 16711 df-pt 16712 df-prds 16715 df-xrs 16769 df-qtop 16774 df-imas 16775 df-xps 16777 df-mre 16851 df-mrc 16852 df-acs 16854 df-mgm 17846 df-sgrp 17895 df-mnd 17906 df-submnd 17951 df-mulg 18219 df-cntz 18441 df-cmn 18902 df-psmet 20531 df-xmet 20532 df-met 20533 df-bl 20534 df-mopn 20535 df-fbas 20536 df-fg 20537 df-cnfld 20540 df-top 21496 df-topon 21513 df-topsp 21535 df-bases 21548 df-cld 21621 df-ntr 21622 df-cls 21623 df-nei 21700 df-cn 21829 df-cnp 21830 df-lm 21831 df-haus 21917 df-tx 22164 df-hmeo 22357 df-fil 22448 df-fm 22540 df-flim 22541 df-flf 22542 df-xms 22924 df-ms 22925 df-tms 22926 df-cfil 23852 df-cau 23853 df-cmet 23854 df-grpo 28264 df-gid 28265 df-ginv 28266 df-gdiv 28267 df-ablo 28316 df-vc 28330 df-nv 28363 df-va 28366 df-ba 28367 df-sm 28368 df-0v 28369 df-vs 28370 df-nmcv 28371 df-ims 28372 df-dip 28472 df-ssp 28493 df-ph 28584 df-cbn 28634 df-hnorm 28739 df-hba 28740 df-hvsub 28742 df-hlim 28743 df-hcau 28744 df-sh 28978 df-ch 28992 df-oc 29023 df-ch0 29024 df-shs 29079 df-chj 29081 df-pjh 29166 |
This theorem is referenced by: (None) |
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