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Mirrors > Home > MPE Home > Th. List > Mathboxes > qusdimsum | Structured version Visualization version GIF version |
Description: Let 𝑊 be a vector space, and let 𝑋 be a subspace. Then the dimension of 𝑊 is the sum of the dimension of 𝑋 and the dimension of the quotient space of 𝑋. First part of theorem 5.3 in [Lang] p. 141 (Contributed by Thierry Arnoux, 20-May-2023.) |
Ref | Expression |
---|---|
qusdimsum.x | ⊢ 𝑋 = (𝑊 ↾s 𝑈) |
qusdimsum.y | ⊢ 𝑌 = (𝑊 /s (𝑊 ~QG 𝑈)) |
Ref | Expression |
---|---|
qusdimsum | ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (dim‘𝑊) = ((dim‘𝑋) +𝑒 (dim‘𝑌))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | qusdimsum.y | . . . 4 ⊢ 𝑌 = (𝑊 /s (𝑊 ~QG 𝑈)) | |
2 | eqid 2821 | . . . 4 ⊢ (Base‘𝑊) = (Base‘𝑊) | |
3 | lveclmod 19877 | . . . . 5 ⊢ (𝑊 ∈ LVec → 𝑊 ∈ LMod) | |
4 | 3 | adantr 483 | . . . 4 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → 𝑊 ∈ LMod) |
5 | simpr 487 | . . . 4 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → 𝑈 ∈ (LSubSp‘𝑊)) | |
6 | eqid 2821 | . . . 4 ⊢ (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) = (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) | |
7 | 1, 2, 4, 5, 6 | quslmhm 30924 | . . 3 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) ∈ (𝑊 LMHom 𝑌)) |
8 | eqid 2821 | . . . 4 ⊢ (0g‘𝑌) = (0g‘𝑌) | |
9 | eqid 2821 | . . . 4 ⊢ (𝑊 ↾s (◡(𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) “ {(0g‘𝑌)})) = (𝑊 ↾s (◡(𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) “ {(0g‘𝑌)})) | |
10 | eqid 2821 | . . . 4 ⊢ (𝑌 ↾s ran (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈))) = (𝑌 ↾s ran (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈))) | |
11 | 8, 9, 10 | dimkerim 31023 | . . 3 ⊢ ((𝑊 ∈ LVec ∧ (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) ∈ (𝑊 LMHom 𝑌)) → (dim‘𝑊) = ((dim‘(𝑊 ↾s (◡(𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) “ {(0g‘𝑌)}))) +𝑒 (dim‘(𝑌 ↾s ran (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)))))) |
12 | 7, 11 | syldan 593 | . 2 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (dim‘𝑊) = ((dim‘(𝑊 ↾s (◡(𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) “ {(0g‘𝑌)}))) +𝑒 (dim‘(𝑌 ↾s ran (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)))))) |
13 | eqid 2821 | . . . . . . . . 9 ⊢ (LSubSp‘𝑊) = (LSubSp‘𝑊) | |
14 | 13 | lsssubg 19728 | . . . . . . . 8 ⊢ ((𝑊 ∈ LMod ∧ 𝑈 ∈ (LSubSp‘𝑊)) → 𝑈 ∈ (SubGrp‘𝑊)) |
15 | 3, 14 | sylan 582 | . . . . . . 7 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → 𝑈 ∈ (SubGrp‘𝑊)) |
16 | lmodabl 19680 | . . . . . . . . . 10 ⊢ (𝑊 ∈ LMod → 𝑊 ∈ Abel) | |
17 | 3, 16 | syl 17 | . . . . . . . . 9 ⊢ (𝑊 ∈ LVec → 𝑊 ∈ Abel) |
18 | 17 | adantr 483 | . . . . . . . 8 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → 𝑊 ∈ Abel) |
19 | ablnsg 18966 | . . . . . . . 8 ⊢ (𝑊 ∈ Abel → (NrmSGrp‘𝑊) = (SubGrp‘𝑊)) | |
20 | 18, 19 | syl 17 | . . . . . . 7 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (NrmSGrp‘𝑊) = (SubGrp‘𝑊)) |
21 | 15, 20 | eleqtrrd 2916 | . . . . . 6 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → 𝑈 ∈ (NrmSGrp‘𝑊)) |
22 | 2, 6, 1, 8 | qusker 30918 | . . . . . . 7 ⊢ (𝑈 ∈ (NrmSGrp‘𝑊) → (◡(𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) “ {(0g‘𝑌)}) = 𝑈) |
23 | 22 | oveq2d 7171 | . . . . . 6 ⊢ (𝑈 ∈ (NrmSGrp‘𝑊) → (𝑊 ↾s (◡(𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) “ {(0g‘𝑌)})) = (𝑊 ↾s 𝑈)) |
24 | 21, 23 | syl 17 | . . . . 5 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (𝑊 ↾s (◡(𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) “ {(0g‘𝑌)})) = (𝑊 ↾s 𝑈)) |
25 | qusdimsum.x | . . . . 5 ⊢ 𝑋 = (𝑊 ↾s 𝑈) | |
26 | 24, 25 | syl6eqr 2874 | . . . 4 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (𝑊 ↾s (◡(𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) “ {(0g‘𝑌)})) = 𝑋) |
27 | 26 | fveq2d 6673 | . . 3 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (dim‘(𝑊 ↾s (◡(𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) “ {(0g‘𝑌)}))) = (dim‘𝑋)) |
28 | 1 | ovexi 7189 | . . . . . 6 ⊢ 𝑌 ∈ V |
29 | eqid 2821 | . . . . . . 7 ⊢ (Base‘𝑌) = (Base‘𝑌) | |
30 | 29 | ressid 16558 | . . . . . 6 ⊢ (𝑌 ∈ V → (𝑌 ↾s (Base‘𝑌)) = 𝑌) |
31 | 28, 30 | ax-mp 5 | . . . . 5 ⊢ (𝑌 ↾s (Base‘𝑌)) = 𝑌 |
32 | 1 | a1i 11 | . . . . . . . . 9 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → 𝑌 = (𝑊 /s (𝑊 ~QG 𝑈))) |
33 | 2 | a1i 11 | . . . . . . . . 9 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (Base‘𝑊) = (Base‘𝑊)) |
34 | ovexd 7190 | . . . . . . . . 9 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (𝑊 ~QG 𝑈) ∈ V) | |
35 | simpl 485 | . . . . . . . . 9 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → 𝑊 ∈ LVec) | |
36 | 32, 33, 6, 34, 35 | quslem 16815 | . . . . . . . 8 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)):(Base‘𝑊)–onto→((Base‘𝑊) / (𝑊 ~QG 𝑈))) |
37 | forn 6592 | . . . . . . . 8 ⊢ ((𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)):(Base‘𝑊)–onto→((Base‘𝑊) / (𝑊 ~QG 𝑈)) → ran (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) = ((Base‘𝑊) / (𝑊 ~QG 𝑈))) | |
38 | 36, 37 | syl 17 | . . . . . . 7 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → ran (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) = ((Base‘𝑊) / (𝑊 ~QG 𝑈))) |
39 | 32, 33, 34, 35 | qusbas 16817 | . . . . . . 7 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → ((Base‘𝑊) / (𝑊 ~QG 𝑈)) = (Base‘𝑌)) |
40 | 38, 39 | eqtr2d 2857 | . . . . . 6 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (Base‘𝑌) = ran (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈))) |
41 | 40 | oveq2d 7171 | . . . . 5 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (𝑌 ↾s (Base‘𝑌)) = (𝑌 ↾s ran (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)))) |
42 | 31, 41 | syl5reqr 2871 | . . . 4 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (𝑌 ↾s ran (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈))) = 𝑌) |
43 | 42 | fveq2d 6673 | . . 3 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (dim‘(𝑌 ↾s ran (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)))) = (dim‘𝑌)) |
44 | 27, 43 | oveq12d 7173 | . 2 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → ((dim‘(𝑊 ↾s (◡(𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈)) “ {(0g‘𝑌)}))) +𝑒 (dim‘(𝑌 ↾s ran (𝑥 ∈ (Base‘𝑊) ↦ [𝑥](𝑊 ~QG 𝑈))))) = ((dim‘𝑋) +𝑒 (dim‘𝑌))) |
45 | 12, 44 | eqtrd 2856 | 1 ⊢ ((𝑊 ∈ LVec ∧ 𝑈 ∈ (LSubSp‘𝑊)) → (dim‘𝑊) = ((dim‘𝑋) +𝑒 (dim‘𝑌))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1533 ∈ wcel 2110 Vcvv 3494 {csn 4566 ↦ cmpt 5145 ◡ccnv 5553 ran crn 5555 “ cima 5557 –onto→wfo 6352 ‘cfv 6354 (class class class)co 7155 [cec 8286 / cqs 8287 +𝑒 cxad 12504 Basecbs 16482 ↾s cress 16483 0gc0g 16712 /s cqus 16777 SubGrpcsubg 18272 NrmSGrpcnsg 18273 ~QG cqg 18274 Abelcabl 18906 LModclmod 19633 LSubSpclss 19702 LMHom clmhm 19790 LVecclvec 19873 dimcldim 30999 |
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 5189 ax-sep 5202 ax-nul 5209 ax-pow 5265 ax-pr 5329 ax-un 7460 ax-reg 9055 ax-inf2 9103 ax-ac2 9884 ax-cnex 10592 ax-resscn 10593 ax-1cn 10594 ax-icn 10595 ax-addcl 10596 ax-addrcl 10597 ax-mulcl 10598 ax-mulrcl 10599 ax-mulcom 10600 ax-addass 10601 ax-mulass 10602 ax-distr 10603 ax-i2m1 10604 ax-1ne0 10605 ax-1rid 10606 ax-rnegex 10607 ax-rrecex 10608 ax-cnre 10609 ax-pre-lttri 10610 ax-pre-lttrn 10611 ax-pre-ltadd 10612 ax-pre-mulgt0 10613 |
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 4567 df-pr 4569 df-tp 4571 df-op 4573 df-uni 4838 df-int 4876 df-iun 4920 df-iin 4921 df-br 5066 df-opab 5128 df-mpt 5146 df-tr 5172 df-id 5459 df-eprel 5464 df-po 5473 df-so 5474 df-fr 5513 df-se 5514 df-we 5515 df-xp 5560 df-rel 5561 df-cnv 5562 df-co 5563 df-dm 5564 df-rn 5565 df-res 5566 df-ima 5567 df-pred 6147 df-ord 6193 df-on 6194 df-lim 6195 df-suc 6196 df-iota 6313 df-fun 6356 df-fn 6357 df-f 6358 df-f1 6359 df-fo 6360 df-f1o 6361 df-fv 6362 df-isom 6363 df-riota 7113 df-ov 7158 df-oprab 7159 df-mpo 7160 df-of 7408 df-rpss 7448 df-om 7580 df-1st 7688 df-2nd 7689 df-supp 7830 df-tpos 7891 df-wrecs 7946 df-recs 8007 df-rdg 8045 df-1o 8101 df-oadd 8105 df-er 8288 df-ec 8290 df-qs 8294 df-map 8407 df-ixp 8461 df-en 8509 df-dom 8510 df-sdom 8511 df-fin 8512 df-fsupp 8833 df-sup 8905 df-inf 8906 df-oi 8973 df-r1 9192 df-rank 9193 df-dju 9329 df-card 9367 df-acn 9370 df-ac 9541 df-pnf 10676 df-mnf 10677 df-xr 10678 df-ltxr 10679 df-le 10680 df-sub 10871 df-neg 10872 df-nn 11638 df-2 11699 df-3 11700 df-4 11701 df-5 11702 df-6 11703 df-7 11704 df-8 11705 df-9 11706 df-n0 11897 df-xnn0 11967 df-z 11981 df-dec 12098 df-uz 12243 df-xadd 12507 df-fz 12892 df-fzo 13033 df-seq 13369 df-hash 13690 df-struct 16484 df-ndx 16485 df-slot 16486 df-base 16488 df-sets 16489 df-ress 16490 df-plusg 16577 df-mulr 16578 df-sca 16580 df-vsca 16581 df-ip 16582 df-tset 16583 df-ple 16584 df-ocomp 16585 df-ds 16586 df-hom 16588 df-cco 16589 df-0g 16714 df-gsum 16715 df-prds 16720 df-pws 16722 df-imas 16780 df-qus 16781 df-mre 16856 df-mrc 16857 df-mri 16858 df-acs 16859 df-proset 17537 df-drs 17538 df-poset 17555 df-ipo 17761 df-mgm 17851 df-sgrp 17900 df-mnd 17911 df-mhm 17955 df-submnd 17956 df-grp 18105 df-minusg 18106 df-sbg 18107 df-mulg 18224 df-subg 18275 df-nsg 18276 df-eqg 18277 df-ghm 18355 df-cntz 18446 df-lsm 18760 df-cmn 18907 df-abl 18908 df-mgp 19239 df-ur 19251 df-ring 19298 df-oppr 19372 df-dvdsr 19390 df-unit 19391 df-invr 19421 df-drng 19503 df-subrg 19532 df-lmod 19635 df-lss 19703 df-lsp 19743 df-lmhm 19793 df-lmim 19794 df-lbs 19846 df-lvec 19874 df-sra 19943 df-rgmod 19944 df-nzr 20030 df-dsmm 20875 df-frlm 20890 df-uvc 20926 df-lindf 20949 df-linds 20950 df-dim 31000 |
This theorem is referenced by: (None) |
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